Question

Vinny auto repair charges $75 an hour for labor plus the cost of parts. Mr sellners car was repaired and repaired $50 worth of parts and h hours of labor. The total cost,C, to repair the car is modeled by this function.

C(h)=75h+50
The total cost to repair the car was $650. How many hours of labor were required?

Select the correct answer below.

A.8hours
B.8 2/3 hours
C.9 1/3hours
D.13 hours

Answer 1

Set C(h)=75h+50 = to 650 and solve for h, the number of hours the repair required:

75h = 600 Dividing both sides by 75,

h = 600/75 = 8 hours (answer)

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