Question

The equation y = 35.25x + 40 gives the labor cost y of repairing a car if it takes x hours to repair the car. Which statement is true?

For every hour of labor, the cost decreases by $40.

For every hour of labor, the cost decreases by $35.25.

For every hour of labor, the cost increases by $40.

For every hour of labor, the cost increases by $35.25.

Answer 1

I believe its D.

Answer 2

Are you sure?

Answer 3

The equation y = 4.75x + 20 gives the cost y of towing a car if the car is towed x miles.


According to the model, what is the best estimate of the cost for towing a car 22 miles?



$24.75

$46.25

$104.50

$124.50

Answer 4

Well its not negative so it wouldn't decline, and 40 doesn't represent the hourly cost so yeah. lol cx

Answer 5

thanks! can you help with the other question?

Answer 6

\[\large y = 4.75x + 20\]

where 'x' is the number of miles...so since we want to know the cost to go 22 miles we have

\[\large y = 4.75(22) + 20\]
\[\large y = 104.5 + 20\]
\[\large y = 124.5\]

Answer 7

Yeah. Briefly. The answer for the second is 104.50

Answer 8

4.75(22) = 104.50

Answer 9

...close...but there is a constant added after that

Answer 10

so that is not the answer?

Answer 11

*refers to my post above :)

Answer 12

would it be 124?

Answer 13

Awesome thanks!

Answer 14

The correlation coefficient (r) between the number of miles driven x and the number of gallons of gasoline used y is 0.925.


What percent of the variation in the number of gallons of gasoline can be explained by differences in the number of miles driven?



7.5%

14.4%

85.6%

92.5%

Answer 15

Oh i forgot about the 20.. Yeah, John's right. lolol.

Most of these questions are easy you just plug in numbers for x or y and then just add or subtract or whatever.

Answer 16

okay what about that ^^^

Answer 17

Oh didn't see a reply

So the correlation coefficient r = 0.925

What we need for variability is R^2 ...so .925^2 = 0.8556

And multiply that by 100 to get the percent which is 85.6%

Answer 18

Thank you so much!

Answer 19

@johnweldon1993

Answer 20

Oh crap, I hate this one haha I remember the long tedious steps to do this

So I'm gonna cheat...1 sec :P

Answer 21

lol okay thanks!

Answer 22

First choice sorry it took so long excel didnt wanna open for me lol :P

Answer 23

no worries!
thankyou!!

Answer 24

np :)

Answer 25

Sorry, I'm literally trying so hard to turn all of my work in on time. Math is my worst subject.

Answer 26

@johnweldon1993