The solution to the expression is x² + x - 20
How to calculate the expression?(x-4)(x+5)
open the bracket
x² + 5x - 4x - 20
x² + x - 20
Hence the solution to the expression leads to quadratic equation which is written is x² + x -20
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Brainliest will be given. find the analogy that best represents the bold letters for each question. as many as you can do is appreciated! an explanation would be nice also. brainliest will be given to the person who answers the most, accurately!!
The analogy that best represents the bold letters for each question is related to relationships and cross-sections.
Some analogies are given below:
Happy : Sad :: Up : DownExplanation: The relationship between happy and sad is that they are opposite emotions.
Similarly, up and down are opposite directions, so the analogy holds.
Cat : Kitten :: Dog : PuppyExplanation: The relationship between a cat and a kitten is that a kitten is a young cat.
Similarly, a puppy is a young dog, so the analogy holds.
Circle : Sphere :: Square : CubeExplanation: The relationship between circle and sphere is that a circle is a two-dimensional shape, while a sphere is a three-dimensional shape that has a circular cross-section.
Similarly, a square is a two-dimensional shape, while a cube is a three-dimensional shape that has a square cross-section, so the analogy holds.
Oven : Baked :: Grill : GrilledExplanation: The relationship between the oven and baking is that an oven is a tool used to bake food.
Similarly, a grill is a tool used to grill food, so the analogy holds.
Mother : Father :: Daughter : SonExplanation: The relationship between mother and father is that they are the parents of a child.
Similarly, a daughter and a son are the children of their parents, so the analogy holds.
Book : Chapter :: Play : ActExplanation: The relationship between a book and a chapter is that a book is divided into chapters.
Similarly, a play is divided into acts, so the analogy holds.
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A company has two machines. During any day, each machine that is working at the beginning of the day has a 1 3 chance of breaking down. If a machine breaks down during the day, it is sent to a repair facility and will be working two days after it breaks down. (Thus, if a machine breaks down during day 3, it will be working at the beginning of day 5. ) Letting the state of the system be the number of machines working at the beginning of the day, formulate a transition probability matrix for this situation
With probability 1, both machines are in the repair facility, and we move to state 2 (both machines working) two days later.
What is the probability that both machines are working at the beginning of the day?Let the state of the system be the number of machines working at the beginning of the day. We have two machines, so the state space is {0, 1, 2}.
Let the probability of transitioning from state i to state j be P(i,j).
To fill in the entries of the transition probability matrix, we need to consider the possible transitions between states.
If both machines are working at the beginning of the day (state 2):
With probability 1/9, both machines break down, and we move to state 0 (neither machine working).With probability 4/9, one machine breaks down and one machine continues to work, and we move to state 1 (one machine working).With probability 4/9, both machines continue to work, and we stay in state 2.If one machine is working at the beginning of the day (state 1):
With probability 1/3, the working machine breaks down, and we move to state 0 (neither machine working).With probability 2/3, the working machine continues to work, and we stay in state 1.If neither machine is working at the beginning of the day (state 0):
With probability 1, both machines are in the repair facility, and we move to state 2 (both machines working) two days later.Putting this all together, we get the following transition probability matrix:
| | 0 | 1 | 2 |
|---|----------|----------|----------|
| 0 | 0 | 0 | 1 |
| 1 | 1/3 | 2/3 | 0 |
| 2 | 1/9 | 4/9 | 4/9 |
For example, the entry in row 1 and column 2 represents the probability of transitioning from state 1 (one machine working) to state 2 (both machines working) and is 4/9.
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The triangle above has the following measures.
s = 29 m
r= 63 m
Find the m/Q.
Round to the nearest tenth and include correct units.
Show all your work.
The value of m∠Q as shown in the right-angled triangle below is 62.59°.
What is a right-angled triangle?A right-angled triangle is a triangle, that has one of its interior angles equal to 90 degrees or any one angle is a right angle.
To calculate the value of m∠Q, we use the formula below
Formula:
m∠Q = cos⁻¹(s/r)........................ Equation 1Where:
s = 29 mr = 63 mSubstitute these values into equation 1
m∠Q = cos⁻¹(29/63)m∠Q = cos⁻¹(0.46)m∠Q = 62.59°Learn more about right-angle triangle here: https://brainly.com/question/31203729
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Will upvote if answer is Complete and correct
The masses mi are located at the points P. Find the center of mass of the system. mi = 4, m2 = 8, m3 = 9. P1 = (-6, - 8), P, = (3, 1), P3 = (6,2). c= IS
To get the center of mass of the system with masses m1 = 4, m2 = 8, and m3 = 9 located at points P1 = (-6, -8), P2 = (3, 1), and P3 = (6, 2), the center of mass of the system is approximately (2.57, -0.29).
Center of Mass (x, y) = (Σ (mi * xi) / Σ mi, Σ (mi * yi) / Σ mi)
First, find the sum of the masses: Σ mi = m1 + m2 + m3 = 4 + 8 + 9 = 21
Next, calculate the x and y coordinates of the center of mass: Σ (mi * xi) = (4 * -6) + (8 * 3) + (9 * 6) = -24 + 24 + 54 = 54,
Σ (mi * yi) = (4 * -8) + (8 * 1) + (9 * 2) = -32 + 8 + 18 = -6.
Now divide these sums by the total mass: x-coordinate = 54 / 21 ≈ 2.57, y-coordinate = -6 / 21 ≈ -0.29.
So, the center of mass of the system is approximately (2.57, -0.29).
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Can someone help me with 15 16 17 18?
Answer:15)5760.1 6)78. 17)582.4 18)112
Step-by-step explanation:
In a nuclear disaster, there are multiple dangerous radioactive isotopes that can be detected. If 91.9% of a particular isotope emitted during a disaster was still present 6 years after the disaster, find the continuous compound rate of decay of this isotope. The continuous compound rate of decay of this isotope is
The first derivative of the implicit function given by x^(2/3) + y^(2/3) = 14 can be found using implicit differentiation. We take the derivative of both sides with respect to x and use the chain rule to differentiate the terms involving y:(2/3)x^(-1/3) + (2/3)y^(-1/3) * dy/dx = 0Then, we solve for dy/dx:dy/dx = -(x/y)^(1/3)This is the first derivative of the implicit function. To evaluate it at a specific point, we need to substitute the coordinates of that point into the equation above.
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The continuous compound rate of decay of this isotope is approximately 1.41%.
In order to find the continuous compound rate of decay of the radioactive isotope, we can use the formula:
N(t) = N0 * e^(-λt)
Where N(t) is the amount of the isotope present at time t, N0 is the initial amount of the isotope, λ is the continuous decay constant, and t is the time elapsed (in this case, 6 years).
We are given that 91.9% of the isotope is still present after 6 years, so:
0.919 = e^(-λ * 6)
To solve for λ, we can take the natural logarithm of both sides:
ln(0.919) = -6λ
Now, we can solve for the decay constant:
λ = -ln(0.919) / 6 ≈ 0.0141
So, the continuous compound rate of decay of this isotope is approximately 1.41%.
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explain how using a table is similar to using a double number line and how it is different
Using a table is similar to using a double number line because the relation between the corresponding would never change.
Given that,
To explain how using a table is similar to using a double number line and how it is different.
What is a number line?A number line is defined as the number marked on the line calibrated into an equal number of units. For example -1, 0, 1, and so on.
Here,
Let assuming some values, in tabulated form,
x y
1 -1
2 -2
3 -3
Now calibrating the x and y in the number line
x = 1 2 3
----------
y = -1 -2 -3
-----------
When comparing the corresponding relationship it remains the same, where it is a table or number line.
Thus, using a table is similar to using a double number line because the relation between the corresponding would never change.
Consider the geometric sequence 1,3,9,27. If n is a integer, which of these functions generate the sequence?
a(n)= 3^n for n>0
b(n) = 3(3)^n for n>0
c(n)= 3^n for n>2
d(n) = 3^n-1 for n>2
The function d(n) = 3^n-1 for n>2 generates the given geometric sequence.
The common ratio of the given geometric sequence is 3, which means that each term is obtained by multiplying the previous term by 3.
a(n)= 3^n for n>0 generates the sequence 3^1, 3^2, 3^3, 3^4, ... = 3, 9, 27, 81, ..., which is not the same as the given sequence.
b(n) = 3(3)^n for n>0 generates the sequence 3(3)^1, 3(3)^2, 3(3)^3, 3(3)^4, ... = 9, 27, 81, 243, ..., which is not the same as the given sequence.
c(n)= 3^n for n>2 generates the sequence 3^3, 3^4, 3^5, 3^6, ... = 27, 81, 243, 729, ..., which is not the same as the given sequence.
d(n) = 3^n-1 for n>2 generates the sequence 3^2, 3^3, 3^4, 3^5, ... = 9, 27, 81, 243, ..., which is the same as the given sequence starting from the third term.
Therefore, the function d(n) = 3^n-1 for n>2 generates the given geometric sequence.
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Answer: A
a(n) = 3^n for n > 0
Step-by-step explanation: Khan
Troy Engines, Limited, manufactures a variety of engines for use in heavy equipment. The company has always produced all of the necessary parts for its engines, including all of the carburetors. An outside supplier has offered to sell one type of carburetor to Troy Engines, Limited, for a cost of $30 per unit. To evaluate this offer, Troy Engines, Limited, has gathered the following information relating to its own cost of producing the carburetor internally:
Per Unit 19,000 Units Per Year
Direct materials $ 12 $ 228,000
Direct labor 10 190,000
Variable manufacturing overhead 3 57,000
Fixed manufacturing overhead, traceable 3* 57,000
Fixed manufacturing overhead, allocated 6 114,000
Total cost $ 34 $ 646,000
*One-third supervisory salaries; two-thirds depreciation of special equipment (no resale value).
Required:
1. Assuming the company has no alternative use for the facilities that are now being used to produce the carburetors, what would be the financial advantage (disadvantage) of buying 19,000 carburetors from the outside supplier?
2. Should the outside supplier’s offer be accepted?
3. Suppose that if the carburetors were purchased, Troy Engines, Limited, could use the freed capacity to launch a new product. The segment margin of the new product would be $190,000 per year. Given this new assumption, what would be the financial advantage (disadvantage) of buying 19,000 carburetors from the outside supplier?
4. Given the new assumption in requirement 3, should the outside supplier’s offer be accepted?
Troy Engines, Limited, could use the freed capacity to launch a new product with a segment margin of $190,000 per year, the financial advantage of buying 19,000 carburetors from the outside supplier can be calculated as follows:
Total cost of producing 19,000 carburetors internally = $646,000
Cost of purchasing 19,000 carburetors from outside supplier = $30 x 19,000 = $570,000
Savings from purchasing carburetors from outside supplier = $646,000 - $570,000 = $76,000
Additional revenue from launching new product = $190,000
Therefore, the total financial advantage of buying 19,000 carburetors from the outside supplier and launching the new product would be $266,000 ($76,000 in savings plus $190,000 in additional revenue).
Based on this analysis, it would be financially advantageous for Troy Engines, Limited, to accept the outside supplier's offer and purchase the carburetors. The savings from purchasing the carburetors would be significant, and the additional revenue from launching the new product would further increase the company's profitability.
However, it's important for the company to consider other factors as well, such as the quality and reliability of the outside supplier's carburetors and the potential impact on the company's reputation.
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In ms. Oaks class 5/12 of the students wear glasses, 2/9 of the students wear earrings, 2/18 of the students wear hats, and 1/4 of the students wear a watch. No one wears more than one of these items. 4 students wear hats.
A. How many students are in ms. Oaks class?
b. Determine how many students wear each type of item.
please explain how you got the answer, im having trouble figuring out how to find the answer
There are 36 students in Ms. Oaks' class. The number of students who wear each type of item is: Glasses: 15 students, Earrings: 8 students, Hats: 4 students and Watch: 9 students
Let the total number of students in Ms. Oaks' class be x.
a) We know that 2/18 of the students wear hats, which is equivalent to 1/9 of the students. We are also told that 4 students wear hats. So, we can set up an equation:
1/9 * x = 4
Solving for x, we get:
x = 36
Therefore, there are 36 students in Ms. Oaks' class.
b) We can now use the information given to determine how many students wear each type of item.
- Glasses: 5/12 of the students wear glasses, which is equivalent to:
(5/12) * 36 = 15 students
- Earrings: 2/9 of the students wear earrings, which is equivalent to:
(2/9) * 36 = 8 students
- Hats: We are told that 4 students wear hats.
- Watch: 1/4 of the students wear a watch, which is equivalent to:
(1/4) * 36 = 9 students
Therefore, the number of students who wear each type of item is:
Glasses: 15 students
Earrings: 8 students
Hats: 4 students
Watch: 9 students
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Pls help me out with this...
Answer:
f(x) = g(x - 9)
Step-by-step explanation:
The transformation from g(x) to f(x) is a translation of 9 units to the right.
A horizontal translation of h units takes place when x is replaced by x - h.
Here, replace x by x - 9.
f(x) = g(x - 9)
(1 point, Consider the series a, where 1 - 2n-4 In this problem you must attempt to use the Ratio Test to decide whether the series converges. Computo 1 L = lim a. Enter the numerical value of the limit Lif it converges, INF if it diverges to infinity, MINF if it diverges to negativo infinity, or Div if it diverges but not to Infinity or negative infinity L = Which of the following statements is true? A. The Ratio Test says that the series converges absolutely B. The Ratio Test says that the series diverges. C. The Ratio Test says that the series converges conditionally D. The Ratio Test is inconclusive, but the series converges absolutely by another test or tests. E. The Ratio Test is inconclusive, but the series diverges by another test or tests. F. The Ratio Test is inconclusive, but the series converges conditionally by another test or tests. Enter the letter for your choice here:
The answer to this given problem on convergent series can be D,E or F.
A series is said to be convergent when it approaches a certain value as the series approaches infinity.
A series is convergent (or converges) if the sequence
To use the Ratio Test, we must compute the limit L = lim (n→∞) |a_n+1 / a_n|.
For the given series a, where a_n = 1 - 2n - 4, we first find a_n+1:
a_n+1 = 1 - 2(n + 1) - 4 = 1 - 2n - 2 - 4 = -1 - 2n - 4.
Now, we compute the limit:
L = lim (n→∞) |(-1 - 2(n + 1) - 4) / (1 - 2n - 4)| = lim (n→∞) |(-1 - 2n - 6) / (1 - 2n - 4)| = lim (n→∞) |-2 / -2| = 1.
Since L = 1, the Ratio Test is inconclusive, so we cannot determine whether the series converges or diverges using this method alone. Therefore, the answer is either D, E, or F. To determine which of these options is true, another test or tests must be used.
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A single gram of a certain metallic substance has 0.52 gram of copper and 0.26 gram of zinc. The remaining portion of the substance is nickel. Ben estimated that 0.2 gram of nickel is in 1 gram of the substance. He used this to estimate the amount of nickel in 35 grams of the substance. Find the result of Ben’s estimate strategy. Then find the exact amount of nickel in 35 grams of the substance.
In one gram of substance 0.22 grams of nickel is present. Then the amount of nickel in the 35 grams of the substance is 7.7 grams.
What are ratio and proportion?A ratio is an ordered couple of numbers a and b, written as a/b where b can not equal 0. A proportion is an equation in which two ratios are set equal to each other.
A single gram of a certain metallic substance has 0.52 grams of copper and 0.26 grams of zinc.
The remaining portion of the substance is nickel.
Let the gram of nickel be x. Then we have
[tex]\sf x + 0.52 + 0.26 = 1[/tex]
[tex]\sf x = 0.22[/tex]
0.22 grams of nickel.
Ben estimated that 0.2 gram of nickel is in 1 gram of the substance.
He used this to estimate the amount of nickel in 35 grams of the substance.
Then we have
[tex]\sf \rightarrow35 \times 0.2 = 7[/tex]
We know that in 1 gram the amount of nickel is 0.22 gram. Then we have
[tex]\sf \rightarrow 35 \times 0.22 = 7.7[/tex]
The amount of nickel in the 35 grams of the substance is 7.7 grams.
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Find the absolute maximum and minimum values of each function over the indicated interval, and indicate the x-values at which they occur. f(x) = 2x^3 - 2x^2 - 2x + 3; (-1,0] The absolute maximum value is__ at x=
(Use a comma to separate answers as needed. Type an integer or a fraction.)
The absolute maximum value is 3 at x=0, and the absolute minimum value is -2 at x=-1.
How to determine the absolute maximum and minimum valuesTo find the absolute maximum and minimum values of the function f(x) = 2x³- 2x² - 2x + 3 over the interval (-1, 0], we'll first find the critical points and then evaluate the function at the endpoints of the interval.
1: Find the derivative of f(x) and set it equal to zero. f'(x) = 6x² - 4x - 2
2: Solve the equation f'(x) = 0 for x to find the critical points. 6x² - 4x - 2 = 0
This quadratic equation does not have rational roots, so there are no critical points in the given interval.
3: Evaluate the function at the endpoints of the interval.
f(-1) = 2(-1)³ - 2(-1)² - 2(-1) + 3 = -2 f(0) = 2(0)³ - 2(0)² - 2(0) + 3 = 3
Since there are no critical points in the interval, the absolute maximum and minimum values occur at the endpoints.
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Mario is buying a number of hamburgers from the local store that cost $2. 90 each. He is also buying one packet of hamburger rolls at a cost of $4. 75. He has $39. 55 to spend at the store. Write and solve an inequality that shows how many hamburgers, h, Mario can afford to buy.
Write the inequality.
_____________
Solve in inequality
______________
The inequality is 2.90h + 4.75 ≤ 39.55, and after solving, we find that Mario can afford to buy a maximum of 12 hamburgers (h ≤ 12).
Let's denote the number of hamburgers Mario can buy as h. We know that each hamburger costs $2.90, and the hamburger rolls cost $4.75. Mario has a total of $39.55 to spend. To write an inequality that represents this situation, we can use the following equation:
2.90h + 4.75 ≤ 39.55
Now, let's solve the inequality:
Step 1: Subtract 4.75 from both sides of the inequality to isolate the term with h.
2.90h ≤ 34.80
Step 2: Divide both sides of the inequality by 2.90 to solve for h.
h ≤ 34.80 / 2.90
Step 3: Perform the division to find the maximum number of hamburgers Mario can buy.
h ≤ 12
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What is the measure of “?”
The part of the figure marked ? is solved to be
113 degrees
How to find the question markThe part of the circle marked by a question mark is solved using the relation as shown below
given angle formed by the tangents = 180 degrees - minor arc GE
information given in the problem includes
given angle formed by the tangents = 67 degrees
minor arc GE = ?
plugging in these values results to
67 degrees = 180 degrees - ?
rearranging the equation
? = 180 degrees - 67
? = 113
hence the required side is 113 degrees
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Find \sin(\angle BAC + 30^{\circ})sin(∠BAC+30
∘
)sine, left parenthesis, angle, B, A, C, plus, 30, degrees, right parenthesis
To find sin(∠BAC + 30°), we will use the sine addition formula. The sine addition formula is: sin(A + B) = sin(A)cos(B) + cos(A)sin(B).
Step 1: Identify the angles A and B in our expression. In this case, A = ∠BAC and B = 30°.
Step 2: Apply the sine addition formula:
sin(∠BAC + 30°) = sin(∠BAC)cos(30°) + cos(∠BAC)sin(30°).
Now you have the expression for sin(∠BAC + 30°). To calculate its value, you will need the values of sin(∠BAC) and cos(∠BAC), which require more information about the triangle.
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the attendance at a school festival was 786 on Friday night,908 on Sunday, and 812 on Sunday. What was the total attendance?
Answer: 2,506 people
Step-by-step explanation:
786 + 908 + 812 = 2,506 people
What is fifteen subtracted by a number x is three more than the product of seven and x in math equation form and solve it
The solution to the Linear equation is x = 1.5.
The math equation for the given problem is 15 - x = 7x + 3.
To solve this equation, first simplify it by combining like terms on one side of the equation.
15 - x - 7x = 3
Next, combine like terms on the left side of the equation.
15 - 8x = 3
Now, isolate the variable by subtracting 15 from both sides of the equation.
-8x = -12
Finally, solve for x by dividing both sides by -8.
x = 1.5
Therefore, the solution to the equation is x = 1.5.
To summarize, the linear equation 15 - x = 7x + 3, we simplify it by combining like terms. Subtracting x and 7x from both sides gives us 15 - 8x = 3. Next, we isolate the variable by subtracting 15 from both sides, resulting in -8x = -12.
Finally, we solve for x by dividing both sides by -8, giving us x = 1.5. This means that when we substitute x with 1.5 in the original equation, both sides will be equal. The solution x = 1.5 satisfies the equation and represents the value at which the equation is true.
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A tennis court in the shape of a rectangle has an area of 7200 square
feet. One pair of sides measures twice the length of the other pair of
sides. What are the dimensions of the tennis court?
Answer:
60 x 120
Step-by-step explanation:
2x(x) = 7200
2[tex]x^{2}[/tex] = 7200 divide both sides by 2
[tex]x^{2}[/tex] = 3600
[tex]\sqrt{x^{2} }[/tex] = [tex]\sqrt{3600}[/tex]
x = 60
This is one of the dimensions. The other dimension is twice 60 or 120.
a = lw
a = (60)(12)
a = 7200
Helping in the name of Jesus.
5. Daniel arrives at his campsite out of breath from his swim and jog. His sister tells him that he should have swam to the boat ramp that is only 200 feet from the campsite and then jogged. She claims that he would have arrived quicker this way. Is Daniel's sister correct? Support your answer mathematically
Since 2 is greater than 1, it would have been faster for Daniel to swim directly to the campsite. Therefore, Daniel's sister is incorrect.
We can solve this problem using the formula for distance, rate, and time, which is:
distance = rate x time
Let's assume that Daniel swims at a rate of s feet per second and jogs at a rate of j feet per second. If he swims directly to the campsite, the distance he needs to cover is the distance d between the campsite and the boat ramp, which is 200 feet. If he swims to the boat ramp and then jogs to the campsite, he will need to cover the distance d twice, once while swimming and once while jogging. The total distance he will cover is 2d = 400 feet.
If Daniel swims directly to the campsite, the time it will take him to cover the distance is:
time1 = d/s
If he swims to the boat ramp and then jogs to the campsite, the time it will take him to cover the distance is:
time2 = d/s + d/j
To compare the two times, we can take their ratio:
time2/time1 = (d/s + d/j)/(d/s) = 1 + j/s
If this ratio is less than 1, then Daniel's sister is correct, and he would have arrived quicker by swimming to the boat ramp and then jogging. If the ratio is greater than 1, then it would have been faster for him to swim directly to the campsite.
Substituting d = 200, we get:
time2/time1 = 1 + j/s = 1 + (j/s)*(200/200) = 1 + (200j)/(ds)
Since Daniel arrives at the campsite out of breath from his swim and jog, we can assume that his rates of swimming and jogging are roughly equal. Let's assume s = j = r, where r is the common rate of swimming and jogging. Substituting this into the ratio, we get:
time2/time1 = 1 + (200r)/(dr) = 1 + 200/d
To determine if Daniel's sister is correct, we need to compare this ratio to 1. If time2/time1 is less than 1, then Daniel's sister is correct. If it is greater than 1, then it would have been faster for Daniel to swim directly to the campsite.
Substituting d = 200, we get:
time2/time1 = 1 + 200/200 = 2
Since 2 is greater than 1, it would have been faster for Daniel to swim directly to the campsite. Therefore, Daniel's sister is incorrect.
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Frank just bought a refrigerator for 1036. He paid 103.60 in a down payment and will pay the rest in 4 equal installments. How much does he need to pay for each installment?
Frank needs to pay $233.10 for each installment.
How much per installment for refrigerator?To determine how much Frank still owes on the refrigerator after paying the down payment. We can subtract the down payment from the total cost of the refrigerator:
Total cost of refrigerator = $1036
Down payment = $103.60
Amount owed = Total cost of refrigerator - Down payment
Amount owed = $1036 - $103.60
Amount owed = $932.40
Next, we need to determine how much Frank will pay for each installment. Since he will pay the remaining balance in 4 equal installments, we can divide the amount owed by 4:
Amount owed = $932.40
Number of installments = 4
Amount per installment = Amount owed / Number of installments
Amount per installment = $932.40 / 4
Amount per installment = $233.10
Therefore, Frank needs to pay $233.10 for each installment to fully pay off the refrigerator. By breaking down the cost into smaller payments, Frank can manage his budget more effectively and avoid the burden of making a large payment all at once.
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Fran is training for her first marathon, and she wants to know if there is a significant difference between the mean number of miles run each week by group runners and individual runners who are training for marathons. She interviews 32 randomly selected people who train in groups, and finds that they run a mean of 49. 0 miles per week. Assume that the population standard deviation from group runners is known to be 4. 2 miles per week
Our calculated t-value (-2.54) is beyond this critical value, we can reject the null hypothesis and conclude that there is a significant difference between the mean number of miles run per week by group runners and individual runners.
To test if there is a significant difference between the mean number of miles run each week by group runners and individual runners who are training for marathons, we can use a two-sample t-test.
Let's assume that the population standard deviation for the individual runners is also 4.2 miles per week.
We can set up the hypotheses as follows:
Null hypothesis: The mean number of miles run per week by group runners and individual runners is the same.
Alternative hypothesis: The mean number of miles run per week by group runners and individual runners is different.
Mathematically, we can write:
H0: μ1 = μ2
Ha: μ1 ≠ μ2
where μ1 is the population mean for group runners and μ2 is the population mean for individual runners.
We are given the sample mean for the group runners, which is 49.0 miles per week. We do not know the sample mean for the individual runners. Let's assume that we collect a random sample of 32 individual runners and find that their sample mean is 52.0 miles per week.
We can calculate the test statistic as follows:
t = (X1 - X2) / sqrt((s1^2/n1) + (s2^2/n2))
where X1 and X2 are the sample means for group runners and individual runners, s1 and s2 are the population standard deviations for group runners and individual runners, and n1 and n2 are the sample sizes for group runners and individual runners.
Plugging in the values, we get:
t = (49.0 - 52.0) / sqrt((4.2^2/32) + (4.2^2/32))
t = -3.0 / 1.182
t = -2.54
Using a t-distribution table with 62 degrees of freedom (32 + 32 - 2), we can find that the critical value for a two-tailed test with a significance level of 0.05 is approximately ±2.0. Since our calculated t-value (-2.54) is beyond this critical value, we can reject the null hypothesis and conclude that there is a significant difference between the mean number of miles run per week by group runners and individual runners.
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Noah edits the school newspaper. He is planning to print a photograph of a flyer for the upcoming school play. The original flyer has an area of 576 square inches. The picture Noah prints will be a dilation of the flyer using a scale factor of . What will be the area of the picture of the flyer in the newspaper?
The area of the picture of the flyer in the newspaper is 36 square inches.
The area of a figure is squared when the dimensions are multiplied by the scale factor k. Thus, if the scale factor of dilation is k, then the area of the new figure will be k² times the area of the original figure. In this case, the scale factor is 0.25, since the picture is a dilation with a scale factor of 1/4. Therefore, the area of the picture will be:
Area of picture = scale factor² x Area of original flyer
Area of picture = (0.25)² x Area of original flyer
= 0.0625 x 576 square inches
= 36 square inches
Therefore, the area of the picture of the flyer in the newspaper will be 36 square inches.
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In a student poll of 38 boys and 42 girls,
15 boys and 20 girls said they like science
fiction books. Based on this information,
Answer:40-45 percent
Step-by-step explanation:
explenation
1. Belinda needs $2400 fast. She has the option of borrowing the $2400 for 5 days at an APR of
500% or borrowing the $2400 for 5 days with a fee of $180. She realizes that neither scenario is
very good, but she wants to choose the option that is best for her. Help Belinda decide which is
the "better" deal. (5 points: Part I - 1 point; Part II - 1 point; Part III - 1 point; Part IV-1 point; Part V
- 1 point)
Part I: What is the length of the period of the $2400 loan for 5 days for a fee of $180?
Part II: What is the number of periods for 1 year?
quod snosy andot mamiatani biw
Part III: What is the periodic interest rate of the $2400 loan for 5 days for a fee of $180?
Answer:
Part 1: 73 periods
Part 2: 73 periods in 1 year - 365/5=73
Part 3: 0.075 periodic interest rate - 180/2400=0.075
Use the appropriate compound interest formula to find the amount that will be in each account, given the stated coins, $47.000 invested at 5% annual interest for 5 years compounded (a) annually: (b) semiannually
a)The amount in the account after 5 years, compounded annually, will be approximately $60,625.06.
b) The amount in the account after 5 years, compounded semiannually, will be approximately $61,588.88.
The amount in the account after 5 years can be calculated using the compound interest formula. For an initial investment of $47,000 at an annual interest rate of 5%, compounded annually or semiannually, the amount in the account will be different.
(a) For compounding annually:
The compound interest formula is given by:
A = P(1 + r/n)^(nt)
where:
A = the amount after time t
P = principal amount (initial investment) = $47,000
r = annual interest rate = 5% or 0.05 (as a decimal)
n = number of times interest is compounded per year = 1 (since it is compounded annually)
t = time period = 5 years
Plugging in the given values, we get:
A = 47000(1 + 0.05/1)^(1*5)
A = 47000(1.05)^5
A ≈ $60,625.06
So, the amount in the account after 5 years, compounded annually, will be approximately $60,625.06.
(b) For compounding semiannually:
The only difference from the above calculation is the value of 'n', which is the number of times interest is compounded per year. In this case, 'n' will be 2, as interest is compounded semiannually (twice a year).
Plugging in the given values, we get:
A = 47000(1 + 0.05/2)^(2*5)
A = 47000(1.025)^10
A ≈ $61,588.88
So, the amount in the account after 5 years, compounded semiannually, will be approximately $61,588.88.
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Pediatricians prescribe 5 milliliters (ml) of acetaminophen for every 25 pounds of a child's weight. how many milliliters of acetaminophen will the doctor prescribe for jocelyn, who weighs 40 pounds?
The doctor would prescribe 8 milliliters of acetaminophen for Jocelyn, who weighs 40 pounds.
According to the given information, pediatricians prescribe 5 milliliters (ml) of acetaminophen for every 25 pounds of a child's weight. So, if a child weighs 50 pounds, the doctor would prescribe 10 ml of acetaminophen.
Now, let's apply this formula to Jocelyn's weight. As Jocelyn weighs 40 pounds, we need to calculate how many 25-pound increments her weight contains. To do this, we can divide her weight by 25:
40 pounds ÷ 25 pounds = 1.6 increments
This means that Jocelyn's weight is equivalent to 1.6 times the 25-pound increment used in the prescription. To determine the amount of acetaminophen she needs, we can multiply 5 ml (the prescribed dose for 25 pounds) by 1.6:
5 ml × 1.6 = 8 ml
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You are throwing a birthday party and are ordering pizza for your guests! You are guessing there will be about 30 people in attendance. You have two options for pizzas! You have budgeted $215 for food so you want to go with the option that will give you the better deal. This means the option that gives you a cheaper price per square inch of pizza
Based on these calculations, option 1 gives you the cheaper price per square inch of pizza.
To determine which option will give you a cheaper price per square inch of pizza, you will need to compare the prices of the two options and calculate their respective prices per square inch.
Let's say option 1 is a large pizza with a diameter of 18 inches and costs $20, while option 2 is a medium pizza with a diameter of 14 inches and costs $15.
To calculate the area of each pizza, you need to use the formula for the area of a circle:
A = πr^2
For option 1, the radius is 9 inches (half of the diameter), so the area is:
A = π(9)^2 = 81π square inches
For option 2, the radius is 7 inches (half of the diameter), so the area is:
A = π(7)^2 = 49π square inches
Now you can calculate the price per square inch for each option by dividing the cost by the area:
Option 1:
Price per square inch = $20 / (81π) = $0.078/square inch
Option 2:
Price per square inch = $15 / (49π) = $0.098/square inch
Based on these calculations, option 1 gives you the cheaper price per square inch of pizza.
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In a random sample of 74 homeowners in a city, 22 homeowners said they would
support a ban on nonnatural lawn fertilizers to protect fish in the local waterways. The sampling
method had a margin of error of ±3. 1%. SHOW ALL WORK!
A) Find the point estimate.
B) Find the lower and upper limits and state the interval
A) The point estimate for the proportion of all homeowners in the city who would support a ban on nonnatural lawn fertilizers is 0.297.
B) The 95% confidence interval for the proportion of all homeowners in the city who would support a ban on nonnatural lawn fertilizers is (0.266, 0.328).
A) The point estimate is the best estimate for the proportion of all homeowners in the city who would support a ban on nonnatural lawn fertilizers to protect fish in the local waterways. We can find this by taking the proportion of homeowners in the sample who said they would support a ban:
point estimate = x/n = 22/74 = 0.297
Therefore, the point estimate for the proportion of all homeowners in the city who would support a ban on nonnatural lawn fertilizers is 0.297.
B) The margin of error is ±3.1%. To find the lower and upper limits of the confidence interval, we can use the following formula:
lower limit = point estimate - margin of error
upper limit = point estimate + margin of error
Substituting the values we know, we get:
lower limit = 0.297 - 0.031 = 0.266
upper limit = 0.297 + 0.031 = 0.328
Therefore, the 95% confidence interval for the proportion of all homeowners in the city who would support a ban on nonnatural lawn fertilizers is (0.266, 0.328).
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