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3 years ago

I need help with answers A,B,C

Mathematics

1 answer:

mezya [45]3 years ago

8 0

The first one is two goals per game I believe

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A model is made for a sports car. The car measures 12 ft in length. The model is 10 inches in length. Write the ratio of car to

Tanya [424]

6:5

basically 12/10
which then reduces. hope this helps :)

3 0

3 years ago

At the fast pack shiping. The employees can unload 25 trucks in 5 hours which of the following is a correct unit rate for this s

Natasha2012 [34]

Answer:

5 trucks per hour

Step-by-step explanation:

25 trucks ÷ 5

5 hours ÷ 5

= 5 trucks per hour

3 0

4 years ago

What is the equation of the best-fitting regression line? Find this in two ways. First, using the regression analysis part of th

Lemur [1.5K]

Step-by-step explanation:

Regression analysis is used to infer about the relationship between two or more variables.

The line of best fit is a straight line representing the regression equation on a scatter plot. The may pass through either some point or all points or none of the points.

Method 1:

Using regression analysis the line of best fit is: $y=\alpha +\beta x+e$

Here α = intercept, β = slope and e = error.

The formula to compute the intercept is:

$\alpha =\bar y-\beta \bar x$

Here $\bar y$ and $\bar x$ are mean of the y and x values respectively.

$\bar y=\frac{\sum y_{i}}{n} \\\bar x=\frac{\sum x_{i}}{n}$

The formula to compute the slope is:

$\beta =\frac{\sum (x-\bar x)(y - \bar y)}{\sum (x=\bar x)^{2}}$

And the formula to compute the error is:

$e=y-\alpha -\beta x$

Method 2:

The regression line can be determined using the descriptive statistics mean, standard deviation and correlation.

The equation of the line of best fit is:

$(y-\bar y)=r\frac{\sigma_{x}}{\sigma_{y}} (x-\bar x)$

Here r = correlation coefficient = $r=\frac{Cov (x,y)}{\sqrt{\sigma^{2}_{x}\sigma^{2}_{y}} }$

$\sigma_{x}$ and $\sigma_{y}$ are standard deviation of x and y respectively.

$\sigma_{x}=\frac{1}{n}\sum (x-\bar x)^{2} \\\sigma_{y}=\frac{1}{n}\sum (y-\bar y)^{2}$

3 0

3 years ago

!!!!How many solutions does the equation have?

Margaret [11]

No solution bc the equations aren't equal to each other

3 0

3 years ago

Read 2 more answers

Dorji thought of a number. He first multiplied the number by 3 and then subtracted 12

jeyben [28]

Answer

The answer is 24

Step-by-step explanation

24 x 3 = 72
72 - 12 = 60
60/6 = 10
10 - 4 = 6

6 0

3 years ago