It is critical to ensure that the requirements for inference are satisfied before doing a two-sample t-test. These criteria include observation independence, normality of the sample distribution, and variance equality.
What exactly is the test statistic?A test statistic is a number produced by a statistical test. It quantifies how much your observed data deviates from the null hypothesis, which states that there is no association between variables or that there is no difference between sample groups.
Shelby might use a two-sample t-test to assess the difference in the mean caffeine content of a huge coffee between the two types (light and dark) if the conditions for the study are met..
Shelby can take the following steps:
As follows, define the null and alternative hypotheses:
The null hypothesis (H0) states that the caffeine content of a large coffee is the same for both kinds (light and dark) (i.e., the difference in means is zero).
Alternative hypothesis (Ha): The mean caffeine amount of a large coffee for the two varieties (light and dark) is not equal (i.e., there is a nonzero difference in means).
Gather the data:
Shelby must acquire a sample of big coffees, both light and dark, and determine their caffeine level.
Determine the test statistic:
Shelby must compute the test statistic t = (x1 - x2) / (s * sqrt(1/n1 + 1/n2), where x1 and x2 are the sample means, s is the pooled standard n1 and n2 represent the sample sizes.
Determine the p-value:
Shelby may obtain the p-value associated with the estimated test statistic by using a t-distribution table or statistical software.
Make a choice:
Shelby can reject the null hypothesis and conclude that there is evidence that the mean caffeine content of a large coffee for the two kinds (light and dark) is different if the p-value is less than the significance threshold (alpha).
Shelby concludes that there is insufficient evidence to establish a difference in the mean caffeine content of a large coffee for the two varieties (light and dark) if the p-value is larger than the significance level (alpha).
It is critical to ensure that the requirements for inference are satisfied before doing a two-sample t-test. These criteria include observation independence, normality of the sample distribution, and variance equality. If these requirements are not satisfied, nonparametric tests, for example, might be employed instead.
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Standard error of the difference = sqrt[(s1²/n1) + (s2²/n2)]
where s1 and s2 are the sample standard deviations, and n1 and n2 are the sample sizes.
What is statistics?
Statistics is a branch of mathematics that deals with the collection, analysis, interpretation, presentation, and organization of numerical data.
To estimate the difference in the mean caffeine content of a large coffee of the two types (light-dark), Shelby can follow these steps:
Collect a random sample of large coffees from each type, ensuring that the sample sizes are large enough to meet the conditions for inference. The conditions for inference include the independence of the samples, the normality of the population distributions, and the equality of the population variances.
Compute the sample mean and standard deviation for each sample.
Compute the difference in sample means, which will give an estimate of the difference in population means.
Construct a confidence interval or perform a hypothesis test to determine whether the difference in sample means is statistically significant.
For a confidence interval, Shelby can use the following formula:
(Difference in sample means) ± (t-value)*(Standard error of the difference)
where the standard error of the difference can be computed using the following formula:
Standard error of the difference = sqrt[(s1²/n1) + (s2²/n2)]
where s1 and s2 are the sample standard deviations, and n1 and n2 are the sample sizes.
For a hypothesis test, Shelby can use the following steps:
State the null and alternative hypotheses.
Determine the level of significance and the appropriate test statistic (t-test).
Calculate the test statistic using the following formula:
t = (Difference in sample means) / (Standard error of the difference)
Determine the p-value associated with the test statistic using a t-distribution table or statistical software.
Compare the p-value to the level of significance to determine whether to reject or fail to reject the null hypothesis.
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The relay race is just over one mile long, approximately yards. If jack and 4 other people each run a leg of the relay. How many yards will each runner run? Justify your answer using an estimation strategy.
We can infer that each runner will cover 352 yards in total using division.
What is division?One of the four fundamental arithmetic operations, or how numbers are combined to create new numbers, is division.
The other operations are multiplication, addition, and subtraction.
For instance, "12 divided by 4" translates to "12 shared into 4 equal groups," which would be 3 in our example.
This is represented by the division sign, or obelus, in mathematics.
So, calculate as follows: Using division
= 1760 / 5
= 352
Therefore, we can infer that each runner will cover 352 yards in total using division.
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Correct question:
The relay race is just over one mile long, approximately "1,760" "1" /"4" yards. If Jack and 4 other people each run a leg of the relay, how many yards will each runner run? Justify your answer using an estimation strategy.
Infuse 0.8 liters for 9 hours at a drop factor of 60 gtt/ ml. how many ml will be infused per hour
the infusion rate is 88.89 ml/hr or 88.89 gtt/min.
What is Rate?
A rate in arithmetic is a ratio that contrasts two separate values with various unit systems. For instance, if John types 50 words per minute, that means he types 50 words per minute. We are dealing with a rate because the word "per" is there. The symbol "/" can be used in place of the word "per" in issues.
When two or more similar amounts or numbers are being compared using the same units, a ratio is utilized. When referring to the ratio of one quantity "to" the second quantity in spoken language, it is frequently written with a colon.
Next, we can use the formula:
Flow rate (ml/hr) = (Volume infused ÷ Time in hours)
Flow rate (ml/hr) = (800 ml ÷ 9 hours)
Flow rate (ml/hr) = 88.89 ml/hr (rounded to two decimal places)
Finally, we can convert the flow rate from ml/hr to drops per minute (gtt/min) using the drop factor of 60 gtt/ml:
Flow rate (gtt/min) = Flow rate (ml/hr) x Drop factor (gtt/ml) ÷ 60 (min/hr)
Flow rate (gtt/min) = (88.89 ml/hr x 60 gtt/ml) ÷ 60 (min/hr)
Flow rate (gtt/min) = 88.89 gtt/min (rounded to two decimal places)
Therefore, the infusion rate is 88.89 ml/hr or 88.89 gtt/min.
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How can the system of equation be represented in a matrix 3x−2y=−25, 5x−2y=−39
?
Answer:
{x,y}={7,-2}
Step-by-step explanation:
3x - 2y = 25
-5x + 2y = -39
[2] 2y = 5x - 39
[2] y = 5x/2 - 39/2
// Plug this in for variable y in equation [1]
[1] 3x - 2•(5x/2-39/2) = 25
[1] -2x = -14
// Solve equation [1] for the variable x
[1] 2x = 14
[1] x = 7
Use the function y= 3/4x-1 to answer parts (a) & (b) below:
a. Find the equation of the inverse function of the given function using only algebra.
b. Using the coordinate grid, show how you can find the inverse function of the given function without using algebra. Then explain in at least one complete sentence how you know you found the correct inverse function based on your graph.
The inverse function of [tex]y = (3/4)x - 1[/tex] is: [tex]y = (4/3)(x + 1)[/tex]).
What is the inverse function of the given function?An inverse function refers to the function that returns the original value for which a function has given the output.
To find the inverse function of y= 3/4x - 1, we must to interchange x and y and solve for y:
x = (3/4)y - 1
x + 1 = (3/4)y
y = (4/3)(x + 1).
b. Finding the inverse function of a given function without using algebra can be done by graphing the function and reflecting it across the line y = x which is known as the reflection property of inverse functions.
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There are 80 students in a certain class taking a test. Seventeen of the students finished the test before 1 hour. twelve more students finished the test before 1.25 hours, and twenty-two students finished the test before 1.75 hours. What percent of the students are still taking the test after 1.75 hours? Round your answer to the nearest hundredth
The percentage of students still writing the test is
23.75%
What is percentage?A percentage is a number or ratio expressed as a fraction of 100. It is often denoted using the percent sign( %).
For example if there are 80 student in a class and 20 are boys, the percentage of boys in the class is ; 20/80 × 100 = 25%
The total number of students that finished the test before 1.75hours = 17+12+22 = 61
The number of students left in the class = 80-61
= 19
Therefore percentage of of the student still taking the test after 1.75 = 19/80 × 100
= 1900/80
= 23.75 %
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I heard that you might have to increase your prices by 12% if I normally pay $45 per order how much would my order be if the price increase happens the price for your next order would be what
On solving the equation, the price for next order is obtained as $50.40.
What is an equation?
A mathematical definition of an equation is a claim that two expressions are equal when they are joined by the equals sign ("=").
If the price increase is 12%, we need to add 12% of the original price to the original price to get the new price.
So, the new price equation would be -
$45 + 12% of $45
= $45 + 0.12*$45
= $45 + $5.40
= $50.40
Therefore, if the price increase happens, the price for your next order would be $50.40.
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Consider a triangle like the one below. Suppose that c=57, b=15 , and C=108°. (The figure is not drawn to scale.) Solve the triangle.
Carry your intermediate computations to at least four decimal places, and round your answers to the nearest tenth.
Answer: the sides of the triangle are a ≈ 41.5, b = 15, and c = 57, and the measures of the angles are A ≈ 42.7°, B ≈ 29.3°, and C = 108°.
Step-by-step explanation:
What is the equation of a circle located (5,-3) and radius of 6?
Answer:
the answer is d
Step-by-step explanation:
Write in point slope form please
Answer:
below
Step-by-step explanation:
in the picture in the picture in the picture in the picture in the picture
Paula’s investments increased by 87.4% in 2020. Those same investments increased by 12.9% in 2012. Calculate the absolute change in the percentage increase amounts from Paula’s investments
the absolute change in the percentage increase amounts from Paula's investments is 74.5%.
What is the percentage?
A percentage that represents a tenth of a quantity. One percent, denoted by the symbol 1%, is equal to one-hundredth of something; hence, 100 percent denotes the full thing, and 200 percent designates twice the amount specified. A portion per hundred is what the percentage denotes. The percentage refers to one in a hundred. The % sign is used to denote it.
The absolute change in the percentage increase amounts is the difference between the two percentages.
Absolute change = |87.4% - 12.9%| = |74.5%| = 74.5%
Therefore, the absolute change in the percentage increase amounts from Paula's investments is 74.5%.
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If a binary logistic regression has a pseudo R-Square (L) of 60%, then a) the model is better than another logistic regression with a R-square (CS) of 50%. b) 60% of the variation in the data can be explained by the logistic regression c) Other types of pseudo R-squares may be greater or less than 60% with the same logistic regression model. d) the model is better than another multiple linear regression model with an R- square of 55%.
The correct answer is c) Other types of pseudo R-squares may be greater or less than 60% with the same logistic regression model.
Pseudo R-squares, such as the one used in logistic regression, are measures of how well the model fits the data, but they cannot be directly compared to R-squared values from other types of regression models. Therefore, we cannot conclude that the logistic regression model with a pseudo R-Square of 60% is better than another logistic regression with an R-square (CS) of 50% or a multiple linear regression model with an R-square of 55%. However, we can say that 60% of the variation in the data can be explained by the logistic regression model, based on its pseudo R-Square value.
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A rocket is launched in the air. Its height in feet is given by h(t) = - 16t ^ 2 + 112t where t represents the time in seconds after launch. What is the appropriate domain for this situation?
Answer:
Step-by-step explanation:
A
How many positive integers less than 1000 have the sum of their digits equal to 4
Answer:
15
Step-by-step explanation:
2x
(3x + 5)
Need a and b answered
Step-by-step explanation:
Triangle has 180 degrees in its interior angles .....90 degrees is the right angle leaving 90 degrees for 2x + 3x+ 5
2x + 3x+5 = 90
5x = 85
x = 17
smallest angle is then 2x = 34 degrees
Divide.
(4x²-24x+15)÷(x−5)
Your answer should give the quotient and the remainder.
In the problem given, the result of the polynomial long division shows that the quotient is 4x - 4 and the remainder is -5.
How to Perform the Division?To perform polynomial long division of (4x²-24x+15) by (x-5), we follow these steps:
4x - 4
--------------
x - 5 | 4x² - 24x + 15
4x² - 20x
------------
-4x + 15
-4x + 20
----------
-5
Therefore, the quotient is 4x - 4 and the remainder is -5.
We can check our answer by verifying that:
(4x - 4) * (x - 5) + (-5) = 4x² - 24x + 15
which is indeed the original polynomial.
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HELP ILL GIVE YOU EVERYTHING
Answer: 33
Step-by-step explanation: I promise its right i got you
Match the word with the definition.
Question 1 options:
Rise
Run
Y Intercept
Ordered Pairs
Perpendicular Lines
Linear Equation
Y-axis
Coordinate plane
Slope
Slope-intercept form
X-axis
Origin
X Intercept
Parallel Lines
Quadrant
1.
Plane with two axes as a frame of reference.
2.
The vertical number line in a coordinate plane
3.
The horizontal number line in a coordinate plane
4.
A pair of numbers that are used to correspond to a point on a graph where the first number is the x-coordinate and the second number is the y-coordinate.
5.
Where the x and y axis meet. The point (0, 0).
6.
One of the four regions into which the x and y axis separate the coordinate plane.
7.
An equation with two variables that makes up a straight line on a coordinate plane.
8.
The vertical change in a line from one point (x1,y1) to a second point (x2, y2).
9.
The horizontal change in a line from one point (x1,y1) to a second point (x2,y2).
10.
The ratio of a line's rise over its run.
11.
The point where a graph crosses the x axis.
12.
The point where a graph crosses the y axis.
13.
A linear equation in the form y = mx + b, where m is the slope and b is the y-intercept.
14.
Lines that have the same slope and never intersect.
15.
Two lines that intersect at a 90° angle. Slopes of these lines are opposite reciprocals.
Step-by-step explanation:
1.
Plane with two axes as a frame of reference. - Coordinate plane
2.
The vertical number line in a coordinate plane - Y-axis
3.
The horizontal number line in a coordinate plane - X-axis
4.
A pair of numbers that are used to correspond to a point on a graph where the first number is the x-coordinate and the second number is the y-coordinate. - Ordered Pairs
5.
Where the x and y axis meet. The point (0, 0). - Origin
6.
One of the four regions into which the x and y axis separate the coordinate plane.- Quadrant
7.
An equation with two variables that makes up a straight line on a coordinate plane. - Linear Equation
8.
The vertical change in a line from one point (x1,y1) to a second point (x2, y2). - Rise
9.
The horizontal change in a line from one point (x1,y1) to a second point (x2,y2). - run
10.
The ratio of a line's rise over its run. - Slope
11.
The point where a graph crosses the x axis. - X Intercept
12.
The point where a graph crosses the y axis. - Y Intercept
13.
A linear equation in the form y = mx + b, where m is the slope and b is the y-intercept. - Slope-intercept form
14.
Lines that have the same slope and never intersect. - Parallel Lines
15.
Two lines that intersect at a 90° angle. Slopes of these lines are opposite reciprocals. - Perpendicular Lines
please mark mine brainliest ⭐⭐⭐⭐
A computer company hired interns from a group of 234 applicants. The table shows the
numbers of applicants who were or were not computer science majors, and the numbers
of applicants who were or were not hired.
INTERNSHIP APPLICANTS
Computer Science Majors Other Majors Total
58
96
102
138
160
234
Hired
Not hired
Total
Match the probabilites with the description.
Column A
1.
2.
3.
38
36
74
4.
What is the probability that the intern had a
Computer Science Major and did not get hired.
What is the probability that the intern had a
major other than Computer Science?
What is the probability that a Computer Science
Major was hired?
What is the probability that an intern with a
major other than Computer Science was not
hired?
Column B
a. Marginal - 68.3%
b. Marginal - 31.6%
c. Joint 43.6%
d. Conditional - 36.2%
e. Joint - 51.2%
f. Conditional - 48.6%
The answers are given below:
e. Joint - 25.9%a. Marginal - 59.4%d. Conditional - 36.25%f. Conditional - 58.97%How to solveGiven the table, we solve for the probabilities:
P(CS Major and Not Hired) = (CS Majors Not Hired) / Total Applicants = 102 / 394
P(CS Major and Not Hired) = 25.9% (e. Joint - 25.9%)
P(Other Major) = (Total Other Majors) / Total Applicants = 234 / 394
P(Other Major) = 59.4% (a. Marginal - 59.4%)
P(Hired | CS Major) = (CS Majors Hired) / Total CS Majors = 58 / 160
P(Hired | CS Major) = 36.25% (d. Conditional - 36.25%)
P(Not Hired | Other Major) = (Other Majors Not Hired) / Total Other Majors = 138 / 234
P(Not Hired | Other Major) = 58.97% (f. Conditional - 58.97%)
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Weekly revenue, in dollars, at Pizza Garden can be modeled by the equation y = 1000 + 18x, whe
sold. The pizzeria's weekly expenses, in dollars, can be modeled by the equation y = 1700 + 13x.
How many pizzas must be sold at Pizza Garden in a week for the pizzeria to break even?
Note: The phrase break even refers to the value where the two functions are equivalent. When x is less than the break-even value, the pizzeria has
revenue below expenses, and so it loses money. When x is above the break-even value, the pizzeria has revenue above expenses, and so it makes a
profit.
O 140
O 540
O 3500
O 3520
Answer:
To find the break-even point, we need to set the revenue equal to the expenses and solve for x:
1000 + 18x = 1700 + 13x
5x = 700
x = 140
Therefore, Pizza Garden needs to sell 140 pizzas in a week to break even. So the answer is 140.
If you know the answer I will give a hundred brainist
Answer:
18.09
Step-by-step explanation:2.4x2.4, then x3.14
Answer:
answers below
Step-by-step explanation:
If you are trying to find the area the answers are:
Earth= 289.52918
Saturn=6,532.5021
The formula for area for a sphere is:
4 x pie x r2
If you are trying to find the volume the answers are:
Earth=57.90584
Saturn=46,647.01596
The formula for volume for a sphere is:
4/3 x pie x r3
Also the radius (r) is half of the diameter, so you divide the diameter by 2.
Please help! (Question on picture)
Required value of the given expression (15w/9) + 4w - 6 is (-23)
What is substitution method?
The substitution method is an algebraic method for solving linear simultaneous equations. This method replaces the value of one variable in one equation with another equation. In this way, we can converted a pair of linear equations into a single linear equation with only one variable which can then be easily solved.
Here given expression is (15w/9) + 4w - 6 and value of w is (-3).
We are simply substituting -3 for w and simplify,
(15w/9) + 4w - 6 = (15(-3)/9) + 4(-3) - 6
= (-45/9) - 12 - 6
= -5 - 12 - 6
= -23
Therefore, when w = -3, the value of the expression (15w/9) + 4w - 6 is -23.
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Question 12/18
6 Units
The volume of a pyramid is 50 cubic units. The base is a square with sides of length 5. What is the height?
(A) 2 Units
10 Units
0v
D) 4 Units
The height of the pyramid is 6 units.
What is the formula of the volume of a pyramid?
The volume of a pyramid is [tex]V = ( \frac{1}{3} ) \times B \times h[/tex], where B is the area of the base and h is the height of the pyramid.
In this case, the base is a square with sides of length 5, so the area of the base is [tex]B = 5 \times 5 = 25 \: square \: units[/tex]
We are also given that the volume of the pyramid is 50 cubic units.
So we are putting these values into the formula and solve for h,
[tex]50 = ( \frac{1}{3} ) \times 25 \times h \\ 150 = 25 \times h \\ h = 6[/tex]
Therefore, the height of the pyramid is 6 units.
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Correct question is "The volume of a pyramid is 50 cubic units. The base is a square with sides of length 5. What is the height?
(A) 2 Units
(B)10 Units
(C) 6 Units
D) 4 Units"
x+y+3=0,2x+3y-4=0.Solve the question graphically
Answer:
To solve the system of equations x + y + 3 = 0 and 2x + 3y - 4 = 0 graphically, we can plot the two lines and find their point of intersection.
First, let's rearrange the equations to the slope-intercept form y = mx + b:
x + y + 3 = 0 => y = -x - 3
2x + 3y - 4 = 0 => y = (-2/3)x + 4/3
Now we can plot these two lines on a graph:
|
3 | o
| /
2 | /
| /
1 | /
| /
0 |/
------------
0 1 2 3
The first line has a y-intercept of -3 and a slope of -1, so we plot a point at (0, -3) and then go down one unit and right one unit to plot another point. We can then draw a line through these two points.
The second line has a y-intercept of 4/3 and a slope of -2/3, so we plot a point at (0,4/3) and then go down two units and right three units to plot another point. We can then draw a line through these two points.
The point where the two lines intersect is the solution to the system. From the graph, we can see that the intersection point is approximately (-3,0).
Therefore, the solution to the system is x = -3 and y = 0.
Question
Two people rented a car from the same agency. The first person drove 1010 miles and paid $232.30 for mileage. The
second person drove 765 miles and paid $175.95 for mileage. What is the agency's fee per mile?
The fee of agency's per mile is $0.23 or 23 cents.
Let the fee charged by agency for per mile drive be $x.
It is given that first people drove 1010 miles and charged $232.30 by agency.
So the equation for first person is,
1010x + y = 232.30........... (i), where y is fixed charge by the agency if it is there.
Also given that second person drove 765 miles and paid $175.95 to agency.
So the equation for the second person is,
765x + y = 175.95 ............. (ii)
Subtracting equation (ii) from equation (i) we get,
1010x + y - 765x - y = 232.30 - 175.95
245x = 56.35
x = 0.23
Hence the fee of agency's per mile is $0.23 or 23 cents.
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Quadrilateral CDEF is a parallelogram. solve for x
Answer:
x = 25
Step-by-step explanation:
the consecutive angles in a parallelogram sum to 180° , that is
∠ C + ∠ D = 180
4x + 28 + 52 = 180
4x + 80 = 180 ( subtract 80 from both sides )
4x = 100 ( divide both sides by 4 )
x = 25
The height of an object in motion at time "t" seconds is given by h(t)=-t^2 + 6t +10. Find the maximum height.
The height of the object at any given time t is given by the function h(t) = -t^2 + 6t + 10. To find the maximum height, we need to find the vertex of the parabola described by this function.
The vertex of a parabola in the form y = ax^2 + bx + c is given by the formula (-b/2a, f(-b/2a)), where f(-b/2a) is the y-coordinate of the vertex.
In this case, a = -1, b = 6, and c = 10, so we have:
t = -b/2a = -6/(-2) = 3
To find the maximum height, we need to evaluate h(3):
h(3) = -(3)^2 + 6(3) + 10 = 9 + 18 + 10 = 37
Therefore, the maximum height of the object is 37 units, which occurs when t = 3 seconds.
Alice wanted to compare birthday cake prices in two supermarkets. She wrote down the daily prices for a few days and found that the difference of the two sample means is $4.01. The standard deviation of the difference of the sample means is $5.46. The 95% confidence interval of the sample mean difference is between and .
Considering a period of 10 days, the 95% confidence interval of the sample mean difference is between $0.1 and $7.9.
What is a t-distribution confidence interval?The t-distribution is used when the standard deviation for the population is not known, and the bounds of the confidence interval are given according to the equation presented as follows:
[tex]\overline{x} \pm t\frac{s}{\sqrt{n}}[/tex]
The variables of the equation are listed as follows:
[tex]\overline{x}[/tex] is the sample mean.t is the critical value.n is the sample size.s is the standard deviation for the sample.The critical value, using a t-distribution calculator, for a two-tailed 95% confidence interval, with 10 - 1 = 9 df, is t = 2.2622.
The parameters for this problem are given as follows:
[tex]\overline{x} = 4.01, s = 5.46, n = 10[/tex]
Then the lower bound of the interval is given as follows:
4.01 - 2.2622 x 5.46/sqrt(10) = 0.1.
The upper bound of the interval is given as follows:
4.01 + 2.2622 x 5.46/sqrt(10) = 7.9.
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invert and multiply 2/3 divide by 4
Inverting and multiplying the expression 2/3 divide by 4, we get 1/3
Inverting and multiplying the expressionsThe expression from the question is given as
2/3 divide by 4
When inverted, we have
2/3 divide by 4 = 2/3 multiplied by 1/4
Express properly
So, we have
2/3 divide by 4 = 2/3 * 1/4
Evaluate the product
So, we have
2/3 divide by 4 = 1/3
Hence, the solution is 1/3
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x-intercepts: (-3, 0) and (3, 0)
Write the equation of the line of symmetry
Answer:
The x-intercepts of a quadratic function are the points where the graph of the function intersects the x-axis. If a quadratic function has x-intercepts at (-3, 0) and (3, 0), then the graph of the function is symmetric with respect to the y-axis.
The line of symmetry of a symmetric function is a vertical line that passes through the vertex of the function. In this case, the vertex of the function is located at the midpoint of the x-intercepts, which is at the point (0,0). Therefore, the equation of the line of symmetry is simply the equation of the vertical line passing through (0,0), which is:
x = 0
So the equation of the line of symmetry is x = 0.
55 Points! Multiple choice algebra question. Photo attached. Thank you!
Answer:
(B ) joint is the answer.
