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.

- emmynimmy

- chestercat

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- Teddyiswatshecallsme

I believe its D.

- emmynimmy

Are you sure?

- emmynimmy

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

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- Teddyiswatshecallsme

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

- emmynimmy

thanks! can you help with the other question?

- johnweldon1993

\[\large y = 4.75x + 20\]
where 'x' is the number of miles...so since we want to know the cost to go 22 miles we have
\[\large y = 4.75(22) + 20\]
\[\large y = 104.5 + 20\]
\[\large y = 124.5\]

- Teddyiswatshecallsme

Yeah. Briefly. The answer for the second is 104.50

- Teddyiswatshecallsme

4.75(22) = 104.50

- johnweldon1993

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

- emmynimmy

so that is not the answer?

- johnweldon1993

*refers to my post above :)

- emmynimmy

would it be 124?

- emmynimmy

Awesome thanks!

- emmynimmy

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%

- Teddyiswatshecallsme

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.

- emmynimmy

okay what about that ^^^

- johnweldon1993

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%

- emmynimmy

Thank you so much!

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- emmynimmy

- johnweldon1993

Oh crap, I hate this one haha I remember the long tedious steps to do this
So I'm gonna cheat...1 sec :P

- emmynimmy

lol okay thanks!

- johnweldon1993

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

- emmynimmy

no worries!
thankyou!!

- johnweldon1993

np :)

- emmynimmy

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- emmynimmy

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

- emmynimmy

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