Answer:
B
Step-by-step explanation:
15 pounds and 5 pounds per day so to figure out how many days you do division. The equation is 15÷5=3 so the answer is 3 days.
a consumer activist decides to test the authenticity of the claim. she follows the progress of 20 women who recently joined the weight-reduction program. she calculates the mean weight loss of these participants as 14.8 pounds with a standard deviation of 2.6 pounds. the test statistic for this hypothesis would be
The test statistic for the hypothesis about a consumer activist decides to test the authenticity of the claim is t = 1.38.
In a hypothesis test, a test statistic—a random variable—is computed from sample data. To decide whether to reject the null hypothesis, you can utilise test statistics. Your results are compared to what would be anticipated under the null hypothesis by the test statistic. The p-value is computed using the test statistic.
A test statistic gauges how closely a sample of data agrees with the null hypothesis. Its observed value fluctuates arbitrarily from one random sample to another. When choosing whether to reject the null hypothesis, a test statistic includes information about the data that is important to consider. The null distribution is the sample distribution of the test statistic for the null hypothesis.
Sample size, n = 20
Sample mean, x = 14.8 pounds
Sample standard deviation, s = 2.6
The null hypothesis is,
[tex]H_o[/tex]: μ ≤ 14
The alternative hypothesis is,
[tex]H_a[/tex] : μ > 14
t-test statistic is defined as:
[tex]t = \frac{x - \mu}{\frac{s}{\sqrt{n} } }[/tex]
[tex]= \frac{14.8 - 14}{\frac{2.6}{\sqrt{20} } }[/tex]
= [tex]\frac{0.8}{0.581}[/tex]
= 1.377
t = 1.38.
Therefore, the test statistic for the hypothesis is 1.38.
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Complete question"
An advertisement for a popular weight-loss clinic suggests that participants in its new diet program lose, on average, more than 14 pounds. A consumer activist decides to test the authenticity of the claim. She follows the progress of 20 women who recently joined the weight-reduction program. She calculates the mean weight loss of these participants as 14.8 pounds with a standard deviation of 2.6 pounds. The test statistic for this hypothesis would be Multiple Choice -1.38 1.38 1.70 -1.70 O O
The original selling price of a jacket was
s
s dollars. The selling price was then changed on two occasions by the store owner. Its price is now represented by
0. 85
(
1. 4
s
)
0. 85(1. 4s). Which expression could explain what happened to the price of the jacket?
The expression that explains what happened to the price of the jacket is 0.85(1.4s), which represents a 40% increase in price followed by a 15% discount.
The expression 0.85(1.4s) represents the current selling price of the jacket, which includes two price changes.
To explain what happened to the price of the jacket, we can break down the expression into two steps:
1. The first change was an increase by 40%, which can be represented as multiplying the original price "s" by 1.4 (100% + 40% = 140% or 1.4). So, the price after the first change is 1.4s.
2. The second change was a discount of 15%, which can be represented as multiplying the price after the first change by 0.85 (100% - 15% = 85% or 0.85). So, the price after both changes is 0.85(1.4s).
So, the expression that explains what happened to the price of the jacket is 0.85(1.4s), which represents a 40% increase in price followed by a 15% discount.
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Find the zeros of each quadratic equation below by graphing.
Pls I need help
The zeros of the quadratic equation are as follows
1. y = -x²+ 6x - 5:
zeros: (1, 0) and (5, 0)
2. y = x² + 2x + 1:
zeros: (-1, 0).
3. y = -x²+ 8x - 17:
zeros: (0, 0) and (0, 0)
4. y = x² - 4:
zeros: (1, 0) and (5, 0)
What is zero of a quadratic equation?Zero in a quadratic equation are x values that make the equation equal to zero. In other words, they are the x-intercepts or roots of a quadratic function.
Using graphical method, a zero is the point of intersection of the curve with the x -axis and this is shown in the graph attached.
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What is the domain of the function f(x)=2x^2+5x-12
The domain of the function f(x) = 2x² + 5x - 12 is all real numbers, or (-∞, ∞).
This is because there are no restrictions on the input values of x that would make the function undefined. In other words, we can input any real number into the function and get a valid output.
To determine the domain of a function, we need to consider any restrictions on the independent variable that would make the function undefined.
Common examples of such restrictions include division by zero, taking the square root of a negative number, or taking the logarithm of a non-positive number. However, in this case, there are no such restrictions, and therefore the domain is all real numbers.
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Calculate the truth value for each compound proposition, using the given truth values for the simple statement letters. Type T or F beneath each letter and operator. Also, identify the main operator of each statement by typing a lowercase x in the box beneath it. Use the provided dropdown menu to indicate whether the compound statement is true or false, given the assigned truth values.
Given Truth Values
True False
K Q
L R
M S
Statement 1: (M ~ R { v ~ S L)
T or F:
Main Operator:
Assuming the given truth values, Statement 1 is____.
Statement 2: (~ S = M ). (L ~ K )
T or F:
Main Operator:
Assuming the given truth values, Statement 2 is____.
Statement 3: ~(R V ~ L) (~ S S)
T or F:
Main Operator:
Assuming the given truth values, Statement 3 is____.
Statement 4: ~ [(Q V ~ S). ~ (R = ~ S)]
T or F:
Main Operator:
Assuming the given truth values, Statement 4 is____.
Statement 5: (S = Q) = [(K ~ M) V ~ (R. ~ L)]
T or F:
Main Operator:
Assuming the given truth values, Statement 5 is_____
Statement 5 is True
Statement 1: (M ∧ ~R) ∨ (~S ∧ L)
T or F: T
Main Operator: ∨
Assuming the given truth values, Statement 1 is True.
Statement 2: (~S ↔ M) ∧ (L ∧ ~K)
T or F: F
Main Operator: ∧
Assuming the given truth values, Statement 2 is False.
Statement 3: ~(R ∨ ~L) ∧ (~S ∨ S)
T or F: F
Main Operator: ∧
Assuming the given truth values, Statement 3 is False.
Statement 4: ~ [(Q ∨ ~S) ∧ ~(R ↔ ~S)]
T or F: T
Main Operator: ~
Assuming the given truth values, Statement 4 is True.
Statement 5: (S ↔ Q) ↔ [(K ∧ ~M) ∨ ~(R ∧ ~L)]
T or F: T
Main Operator: ↔
Assuming the given truth values, Statement 5 is True.
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Abigail just measured her pet snake and found out it is 111 inches long. The last time she measured, the snake was 74 inches long. What percent longer is the pet snake now?
50% is the percentage the snake is longer if the new measurement is 111 inches and the previous one was 74 inches.
The growth percent refers to the percent of the growth in the length of the snake. It is calculated by the growth divided by the original length multiplied by 100.
Growth rate = [tex]\frac{L-l}{l}*[/tex] 100
where L is the new length
l is the original length
L = 111 inches
l = 74 inches
Growth = 111 - 74
= 37 inches
Growth percent = [tex]\frac{37}{74}[/tex] * 100
= 50%
The growth rate of Abigail's pet snake comes out to be 50%
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What is the scale factor for the similar figures below?
The value of the scale factor for the similar figures is 1/4
What is the scale factor for the similar figures?From the question, we have the following parameters that can be used in our computation:
The similar figures
The corresponsing sides of the similar figures are
Original = 8
New = 2
Using the above as a guide, we have the following:
Scale factor = New /Original
substitute the known values in the above equation, so, we have the following representation
Scale factor = 2/8
Evaluate
Scale factor = 1/4
Hence, the scale factor for the similar figures is 1/4
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You earn $130.00 for each subscription of magazines you sell plus a salary of $90.00 per week. How many subscriptions of magazines do you need to sell in order to make at least $1000.00 each week?
The subscriptions of magazines you need to sell is at least 7
How many subscriptions of magazines do you need to sell?From the question, we have the following parameters that can be used in our computation:
Earn $130.00 for each subscription of magazines You sell plus a salary of $90.00 per weekUsing the above as a guide, we have the following:
f(x) = 130x + 90
In order to make at least $1000.00 each week, we have
130x + 90 = 1000
So, we have
130x = 910
Divide by 130
x = 7
Hence, the number of orders is 7
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How is the product of a complex number and a real number represented on the complex plane?
Consider the product of 2−4i and 3.
Drag a value or phrase into each box to correctly complete the statements
The product of 2-4i and 3 is represented on the complex plane as a vector with magnitude 6√5 and angle -63.43 degrees, starting from the origin.
To represent the product of a complex number and a real number on the complex plane:
We multiply the real part and the imaginary part of the complex number by the real number.
The magnitude (or length) of the resulting complex number is multiplied by the absolute value of the real number.
The angle (or argument) of the resulting complex number is the same as the angle of the original complex number.
For the product of 2−4i and 3:
We multiply the real part (2) and the imaginary part (-4i) of the complex number by the real number (3), to get:
3(2) + 3(-4i) = 6 - 12i
The magnitude of the resulting complex number is:
|6 - 12i| = √(6² + (-12)²) = √180 = 6√5
The angle of the resulting complex number is the same as the angle of the original complex number (2-4i), which can be found using the inverse tangent function:
tanθ = (imaginary part) / (real part) = (-4) / 2 = -2
θ = atan(-2) ≈ -1.107 radians or ≈ -63.43 degrees
Therefore, the product of 2-4i and 3 is represented on the complex plane as a vector with magnitude 6√5 and angle -63.43 degrees, starting from the origin.
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Mike can mop McDonald's in three hours. Nancy can mop the same store in 4 hours. If they worked together how long would it take them?
The combined time if Mike and Nancy worked together is approximately 1.71 hours.
To answer your question, we can use the concept of work rates. Mike can mop McDonald's in 3 hours and Nancy can do it in 4 hours. To find the combined work rate, we can use the formula:
1/Mike's rate + 1/Nancy's rate = 1/combined rate
1/3 + 1/4 = 1/combined rate
To solve for the combined rate, we can find a common denominator for the fractions:
(4 + 3) / (3 × 4) = 1/combined rate
7/12 = 1/combined rate
Now we can find the combined time by inverting the combined rate:
Combined time = 12/7
So, if Mike and Nancy worked together, they would mop McDonald's in 12/7 hours, which is approximately 1.71 hours.
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Main answer:
Working together, Mike and Nancy can mop the McDonald's in 12/7 hours or approximately 1.71 hours (rounded to two decimal places).
Explanation:
To solve the problem, we can use the following formula:
time = work / rate
where time is the time it takes to complete the job, work is the amount of work to be done (which in this case is mopping the McDonald's), and rate is the rate of work, or the amount of work done per unit of time.
Let's let x be the time it takes for Mike and Nancy to mop the McDonald's together. Then, we can set up two equations based on the given information:
x = work / (Mike's rate of work)
x = work / (Nancy's rate of work)
To solve for x, we can use the fact that the amount of work to be done is the same in both equations. So we can set the two equations equal to each other:
work / (Mike's rate of work) = work / (Nancy's rate of work)
Simplifying this equation by multiplying both sides by (Mike's rate of work)*(Nancy's rate of work), we get:
work * (Nancy's rate of work) = work * (Mike's rate of work)
We can cancel out the work on both sides, and then solve for x:
x = 1 / [(1/Mike's rate of work) + (1/Nancy's rate of work)]
Substituting in the given rates of work, we get:
x = 1 / [(1/3) + (1/4)] = 12/7
Therefore, it takes Mike and Nancy 12/7 hours, or approximately 1.71 hours (rounded to two decimal places), to mop the McDonald's together.
In a group of 20 people, 13 people like tea, 12 people like coffee and 3 people like neither tea nor coffee. How many people like tea but not coffee?
Answer:
8 people
Step-by-step explanation:
Tea- 13 people
Coffee- 12 people
Neither- 3 people
20 - 3 = 17
12 + 13 = 25
25 - 17 = 8
Each expression represents an objectâs distance from the ground in meters as a function of time, t, in seconds.
Object A: â5t2+25t+50
Object B: â5t2+50t+25
a. Which object was launched with the greatest vertical speed?
b. Which object was launched from the greatest height?
please help
Object B was launched with the greatest vertical speed and Object A was launched from the greatest height of 50 meters.
a. The vertical speed of an object launched can be calculated using the derivative of the distance function with respect to time. Taking the derivative of the distance function of Object A with respect to time, we get:
v(t) = -10t + 25
Taking the derivative of the distance function of Object B with respect to time, we get:
v(t) = -10t + 50
Comparing the two velocity functions, we can see that Object B was launched with the greatest vertical speed because its velocity function has a higher initial velocity (50 m/s) than that of Object A (25 m/s).
b. The initial height of an object launched can be determined by finding the value of its distance function when t=0.
For Object A, the distance function when t=0 is:
-5(0)^2 + 25(0) + 50 = 50 meters
For Object B, the distance function when t=0 is:
-5(0)^2 + 50(0) + 25 = 25 meters
Therefore, Object A was launched from the greatest height of 50 meters.
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Determine whether each statement regarding surface area is true, Select True or False for each
statement
1. The surface area of a cone is the sum of the areas of a circle and sector of a circle.
2. The surface area of a sphere is greater than a cube's with s=r.
3. A composite figure's surface area is the sum of each individual figure's surface area.
The first statement about the surface area in the question are false, the second statement about surface area is false and the third statement about surface area is true respectively.
1. False. The surface area of a cone is the sum of the areas of the circular base and the curved lateral surface.
2. False. The surface area of a sphere is given by 4πr^2, while the surface area of a cube with side length s=r is 6r^2. Since 4πr^2 is less than 6r^2 for any value of r, the surface area of a sphere is actually less than the surface area of such a cube.
3. True. The surface area of a composite figure is the sum of the surface areas of each individual figure that make up the composite figure.
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Jocelyn's car tires are spinning at a rate of 120 revolutions per
minute. If her car's tires are 28 inches in diameter, how many
miles does she travel in 5 minutes? Round to the nearest
hundredth. 63360 inches = 1 mile.
The required answer is Jocelyn travels approximately 0.83 miles in 5 minutes.
Jocelyn's car tires are spinning at a rate of 120 revolutions per minute. If her car's tires are 28 inches in diameter, we can calculate the distance traveled in one revolution by finding the circumference of the tire:
Circumference = π x diameter
Circumference = 3.14 x 28 inches
Circumference ≈ 87.92 inches
So in one revolution, the car travels approximately 87.92 inches. To find out how many miles Jocelyn travels in 5 minutes, we need to multiply the number of revolutions in 5 minutes (which is 120 revolutions per minute x 5 minutes = 600 revolutions) by the distance traveled in one revolution (87.92 inches).
Distance traveled in 5 minutes = 600 revolutions x 87.92 inches/revolution
Distance traveled in 5 minutes = 52,752 inches
To convert inches to miles, we can use the conversion factor given: 1 mile = 63,360 inches.
Distance traveled in 5 minutes = 52,752 inches ÷ 63,360 inches/mile
Distance traveled in 5 minutes ≈ 0.83 miles
Therefore, Jocelyn travels approximately 0.83 miles in 5 minutes with her car tires spinning at a rate of 120 revolutions per minute. Rounded to the nearest hundredth, the answer is 0.83 miles.
To find out how many miles Jocelyn travels in 5 minutes, follow these steps:
1. Calculate the circumference of one tire: Circumference = Diameter × π.
Circumference = 28 inches × π ≈ 87.96 inches.
2. Determine the distance traveled in one revolution: One revolution covers the circumference of the tire, which is 87.96 inches.
3. Calculate the distance traveled in one minute: 120 revolutions per minute × 87.96 inches per revolution ≈ 10,555.2 inches per minute.
4. Determine the distance traveled in 5 minutes: 10,555.2 inches per minute × 5 minutes = 52,776 inches.
5. Convert the distance from inches to miles: 52,776 inches ÷ 63,360 inches per mile ≈ 0.83 miles.
So, Jocelyn travels approximately 0.83 miles in 5 minutes.
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How much money did Susan earn per hour
Answer:
$9.50
Step-by-step explanation:
Divide the total earnings by total hours.
write any ten ordered pairs in which the first elements is country the second element is its capital
Answer:
Sure, here are ten ordered pairs with the country as the first element and the capital as the second element:
1. (France, Paris)
2. (United States, Washington D.C.)
3. (China, Beijing)
4. (Mexico, Mexico City)
5. (Brazil, Brasília)
6. (Japan, Tokyo)
7. (Canada, Ottawa)
8. (Germany, Berlin)
9. (Australia, Canberra)
10. (India, New Delhi)
in the absence of predators the natural growth rate of rabbits is 4% per year. a population begins with 100 rabbits. the function f(x) = 100(1.04) ^x gives the population of rabbits in x years. how long will it take the population of rabbits to double? how long will it take the population of rabbits to reach 1000?
a) It will take approximately 16.85 years for the rabbit population to double.
b) It will take approximately 37.28 years for the rabbit population to reach 1000.
The formula for calculating the population of rabbits in x years, starting with 100 rabbits and a natural growth rate of 4% per year, is given by:
f(x) = 100(1.04)ˣ
(a) To find out how long it will take for the rabbit population to double, we need to solve the following equation:
100(1.04)ˣ = 200
Dividing both sides by 100, we get:
(1.04)ˣ = 2
Taking the logarithm of both sides with base 1.04, we get:
x = log₁.₀₄ 2
Using a calculator, we get:
x ≈ 16.85
(b) To find out how long it will take for the rabbit population to reach 1000, we need to solve the following equation:
100(1.04)ˣ = 1000
Dividing both sides by 100, we get:
(1.04)ˣ = 10
Taking the logarithm of both sides with base 1.04, we get:
x = log₁.₀₄ 10
Using a calculator, we get:
x ≈ 37.28
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John is planning an end of the school year party for his friends he has $155 to spend on soda and pizza he knows he has to buy 10 2 L bottles of soda choose the any quality and calculate the greatest number of pizzas he can buy
If John has to buy 10 "2-Liter" bottles of soda, then the inequality representing this situation is "10(1.50) + 7.50p ≤ 150" and greatest number of pizzas he can buy is 18, Correct option is (d).
Let "p" denote the number of "large-pizzas" that John can buy.
One "2-liter" bottle of soda cost is = $1.50,
So, the cost of the 10 bottles of soda is : 10 × $1.50 = $15,
one "large-pizza's cost is = $7.50,
So, the cost of p large pizzas is : $p × $7.50 = $7.50p,
The "total-cost" of the soda and pizza must be less than or equal to $150, so we can write the inequality as :
10(1.50) + 7.50p ≤ 150
Simplifying the left-hand side of the inequality,
We get,
15 + 7.50p ≤ 150
7.50p ≤ 135
p ≤ 18
Therefore, John can buy at most 18 large pizzas with his remaining budget, the correct option is (d).
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The given question is incomplete, the complete question is
John is planning an end of the school year party for his friends he has $150 to spend on soda and pizza.
Soda (2-liter) costs $1.50;
large pizza cost $7.50;
He knows he has to buy 10 "2-Liter" bottles of soda.
Choose the inequality and calculate the greatest number of pizzas he can buy.
(a) 10(1.50) + 7.50p ≥ 150; 54 pizzas
(b) 10(7.50) + 1.50p ≤ 150; 53 pizzas
(c) 10(7.50) + 1.50p ≥ 150; 19 pizzas
(d) 10(1.50) + 7.50p ≤ 150; 18 pizzas
write 1/r^2 in terms of spherical bessel functions
The function 1/[tex]r^2[/tex] can be expressed in terms of the spherical Bessel functions of the first kind, which are a family of solutions to the spherical Bessel differential equation.
The expansion involves a combination of the delta function and the first two spherical Bessel functions, j_0(r) and j_1(r). Specifically, the expansion can be written as (1/2)*[pi * delta(r) + (1/r)*d/d(r)(r * j_0(r)) + (1/[tex]r^2[/tex])*d/d(r)[[tex]r^2[/tex] * j_1(r)]]. This expansion is valid for all values of r except for r=0, where the first term dominates. The spherical Bessel functions are commonly used in physics, particularly in the context of scattering problems and wave propagation.
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What is the FICA tax on an income of $47,000? Remember that FICA is
taxed at 7.65%
The FICA tax will be $3595.5 on an income of $47,000.
Given that the principal amount = $47,000
Given that the FICA is taxed at the percentage of 7.65%
To findout the FICA tax we have to findout the 7.65% of money from the principal money $47,000.
The formula for finding the Y% of money from Z amount is = [tex]\frac{y}{100}[/tex] * Z
From the above formula, we can find the FICA tax.
FICA tax = [tex]\frac{7.65}{100}[/tex] * 47000 = 0.0765 * 47000 = 3595.5.
From the above solution, we can conclude that the FICA tax on an income of $47,000 is $3595.5
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The linear density of a rod of length 9 m is given by p(a) - 3+2017 - measured in kilograms per meter, where is measured in meters from one end of the rod. Find the total mass of the rod. Total mass = kg
The total mass of the rod is 81622.5 kg. To find the total mass of the rod, you need to integrate the linear density function with respect to the length of the rod.
To find the total mass of the rod, we need to integrate the linear density function over the entire length of the rod.
Let's start by finding the linear density function at the end of the rod, which is a = 9:
p(9) = 3 + 2017 = 2020 kg/m
Now we can integrate the linear density function from a = 0 to a = 9 to find the total mass:
m = ∫₀⁹ p(a) da
m = ∫₀⁹ (3 + 2017a) da
m = [3a + 1008.5a²] from 0 to 9
m = (3(9) + 1008.5(9)²) - (3(0) + 1008.5(0)²)
m = 81622.5 kg
Therefore, the total mass of the rod is 81622.5 kg.
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You pick a card at random. Without putting the first card back, you pick a second card at random
What is the probability of picking an odd number and then picking an even number?
The probability of picking an odd number and then picking an even number 5/18
The probability of picking an odd number on the first card is 1/2 since there are 5 odd cards out of 10 total cards. After picking an odd card, there are now 4 odd cards and 5 even cards left out of a total of 9 cards. So the probability of picking an even card on the second draw is 5/9.
To find the probability of both events happening, we multiply the probabilities:
P(odd and even) = P(odd) * P(even | odd)
= (1/2) * (5/9)
= 5/18
Therefore, the probability of picking an odd number and then picking an even number is 5/18.
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Please help me im struggling sm
The measurements are x = 7 and ∠NJK = 51°
Given is a rectangle, we need to find the asked measurement,
So,
Since we know that the diagonals of a rectangle bisect each other,
So,
JN + JN = JL
4x+4+4x+4 = 5x+29
8x+8 = 5x+29
3x = 21
x = 7
And,
The vertex angle is 90° so,
∠NMJ + ∠NML = 90°
∠NML = 51°
Also,
∠NML = ∠NJK because they are alternate angles,
So, ∠NJK = 51°
Hence x = 7 and ∠NJK = 51°
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BRANLYIST IF YOU ASWER ALL 5 RIGHT
1. How many students chose walking as their preferred method of transportation?
A 6
B 3
C 9
D none of these
2. How many total students participated in the survey?
A 10
B 20
C 15
D none of these
3. What percentage of the total students chose skateboarding?
A 10%
B 20%
C 30%
D none of these
4. What percentage of the boys chose walking?
A 30%
B 45%
C 25%
D none of these
5. What percentage of the students who chose biking were girls?
A 30%
B 37. 5%
C 45%
D none of these
1. The number of students choosing walking as their preferred method of transportation is 9. Therefore, the correct option is C.
2. The total students participated in the survey are 20. Therefore, the correct option is B.
3. The percentage of the total students choosing skateboarding is 10%. Therefore, the correct option is A.
4. The percentage of the boys choosing walking is 30%. Therefore, the correct option is A.
5. The percentage of the students who chose biking were girls is 37.5%. Therefore, the correct option is B.
1. The number of students who chose walking as their preferred method of transportation based on the information provided is 9. The total number of students who chose walking is given as 9 (3 boys + 6 girls). Hence the correct answer is option C.
2. The total students who participated in the survey based on the information provided are 20. The total number of students is given as 20 (10 boys + 10 girls). Hence the correct answer is option B.
3. The percentage of the total students who chose skateboarding based on the information provided is 10%. 3 students chose skateboarding out of 20 total students, so the percentage is (3/20) * 100% = 10%. Hence the correct answer is option A.
4. The percentage of the boys who chose walking based on the information provided is 30%. 3 boys chose walking out of 10 total boys, so the percentage is (3/10) * 100% = 30%. Hence the correct answer is option A.
5. The percentage of the students who chose biking were girls based on the information provided is 37.5%. 3 girls chose biking out of 8 total students who chose biking, so the percentage is (3/8) * 100% = 37.5%. Hence the correct answer is option B.
Note: The question is incomplete. The complete question probably is: Given the following data:
Activity Boys Girls Total
Walk 3 6 9
Bike 5 3 8
Skateboard 2 1 3
Total 10 10 20
1. How many students chose walking as their preferred method of transportation? A. 6 B. 3 C. 9 D. none of these. 2. How many total students participated in the survey? A. 10 B. 20 C. 15 D. none of these 3. What percentage of the total students chose skateboarding? A. 10% B. 20% C. 30% D. none of these. 4. What percentage of the boys chose walking? A. 30% B. 45% C. 25% D. none of these. 5. What percentage of the students who chose biking were girls? A. 30% B. 37. 5% C. 45% D. none of these.
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please help with the question in the image !!
Answer:
image dosent load
Step-by-step explanation:
Answer:
a = 80°, b = 100°, c = 80°, d = 100°
Step-by-step explanation:
You know a + b + c + d = 360°.
Plugging b + c + d = 280° into the formula above:
a + 280° = 360°.
a = 80°.
You know a + d = 180° because of angles on a straight line. Solve for d:
80° + d = 180°.
d = 100°.
For the same reason, you know a + b = 180°. b must be equal to d, which is 100°.
Lastly, c + d = 180° because they make up the second line. Solve for c:
c + 100° = 180°.
c = 80°.
a = 80°, b = 100°, c = 80°, d = 100°.
Suppose the surface area for a can having a particular volume is minimized when the height of the can is equal to 22 cm. If the surface area has been minimized, what would you expect the radius of the can to be? (Round your answer to the nearest tenth if
necessary. You do not need to include the unit.)
If the surface area of a can with a particular volume is minimized when the height of the can is 22 cm, we would expect the radius of the can to be the same as the height, given that a cylinder has the smallest surface area when its height and radius are equal.
The surface area of a can with height h and radius r can be given by the formula:
A = 2πr² + 2πrh
The volume of the can is given by:
V = πr²h
If we differentiate the surface area with respect to r and equate it to zero to find the critical point, we get:
dA/dr = 4πr + 2πh(dr/dr) = 0
Simplifying this expression, we get:
2r + h = 0
Since we know that the height of the can is 22 cm, we can substitute h = 22 in the equation to get:
2r + 22 = 0
Solving for r, we get:
r = -11
Since the radius of the can cannot be negative, we discard this solution. Therefore, the radius of the can should be equal to its height, which is 22 cm.
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A particular fruits weight are normally disturbed, with a mean of 374 grams and a standard deviation of 20grams. the heaviest 20% of fruits weigh more than how many grams? answer to the nearest gram.
The weight of the heaviest 20% of fruits can be estimated using the z-score corresponding to the 80th percentile, which is 0.84.
The weight can be calculated by adding the z-score multiplied by the standard deviation to the mean weight. Therefore, the weight of the heaviest 20% of fruits is approximately 405 grams.
To calculate this, we first need to find the z-score for the 80th percentile, which is 0.84. Then, we can use the formula z = (x - mu) / sigma, where x is the weight we want to find, mu is the mean weight, and sigma is the standard deviation.
Rearranging this formula to solve for x, we get x = z * sigma + mu. Plugging in the values we have, we get x = 0.84 * 20 + 374 = 405.2 grams. Rounding this to the nearest gram, we get the answer of 405 grams.
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AABC DEF. What sequence of transformations will move AABC onto ADEF?
A. A dilation by a scale factor of 2, centered at the origin, followed by
a reflection over the y-axis
B. The translation (x, y) - (x + 7, y), followed by a dilation by a scale
factor of 2 centered at the origin
C. A dilation by a scale factor of 2, centered at the origin, followed by
the translation
(x,y) → (x+7, y)
D. A dilation by a scale factor of 2, centered at the origin, followed by
the translation (x, y) - (x+7, y)
Therefore, the correct sequence of transformations is:
Dilation by a scale factor of 2, centered at the origin.
Translation of 7 units to the left.
This is equivalent to option D.
To move AABC onto ADEF, we need to perform a sequence of transformations that will map each point of AABC onto the corresponding point of ADEF. Let's first label the vertices of AABC and ADEF as shown:
We can see that A and D have the same coordinates, so we only need to map B, C, and A' to E, F, and D', respectively.
Option A suggests a dilation by a scale factor of 2, centered at the origin, followed by a reflection over the y-axis. This transformation will map B to E, but it will also map C to C' which is not the same as F. Moreover, A' will be mapped to a point that is reflected over the y-axis and does not coincide with D. Therefore, option A is not the correct answer.
Option B suggests a translation of 7 units to the right, followed by a dilation by a scale factor of 2 centered at the origin. This transformation will not map B to E, but it will map A' to D', and C to a point that is 7 units to the right of F. Therefore, option B is not the correct answer either.
Option C suggests a dilation by a scale factor of 2, centered at the origin, followed by a translation of 7 units to the right. This transformation will map A' to D', and B to a point that is 7 units to the right of E. However, it will also map C to a point that is 7 units to the right of F, which is not the same as F. Therefore, option C is not the correct answer.
Option D suggests a dilation by a scale factor of 2, centered at the origin, followed by a translation of 7 units to the left. This transformation will map B to E, and A' to D', but it will also map C to a point that is 7 units to the left of F. However, if we reflect the resulting figure over the y-axis, we obtain the desired result.
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If we roll a regular, 6-sided die 5 times. What is the probability that at least one value is observed more than once
The probability that at least one value is observed more than once when rolling a regular 6-sided die 5 times is approximately 0.598.
The total number of possible outcomes when rolling a die 5 times is 6⁵ = 7776 (since there are 6 possible outcomes for each roll and there are 5 rolls). To calculate the number of outcomes where no value is repeated, we can use the permutation formula: P(6,5) = 6! / (6-5)! = 6! / 1! = 720, since there are 6 possible outcomes for the first roll, 5 for the second roll (since one outcome has been used), and so on.
So, the probability of not observing any repeated values is P(no repeats) = 720 / 7776 ≈ 0.0926. Therefore, the probability of observing at least one repeated value is P(at least one repeat) = 1 - P(no repeats) ≈ 0.9074.
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Question 13
"s
the measure of one of the small angles of a right triangle is 30 less than 7 times
small angle. find the measure of both angles.
smallest angle:
other non-right angle:
add work
> next question
The smallest angle measures 15 degrees and the other non-right angle measures 75 degrees.
To find the measure of both angles in a right triangle with the given conditions, we will use the information provided:
Let x be the measure of the smallest angle. The problem states that the measure of one of the small angles is 30 less than 7 times the smallest angle, which can be written as:
Other non-right angle = 7x - 30
Since this is a right triangle, the sum of the two small angles must be 90 degrees (because the other angle is 90 degrees, and the sum of angles in a triangle is 180 degrees). So, we can set up the following equation:
x + (7x - 30) = 90
Now, solve for x:
8x - 30 = 90
8x = 120
x = 15
So, the smallest angle is 15 degrees. Now, we can find the measure of the other non-right angle:
Other non-right angle = 7x - 30 = 7(15) - 30 = 105 - 30 = 75 degrees
In summary, the smallest angle measures 15 degrees and the other non-right angle measures 75 degrees.
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