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16-07-2017
Mathematics

contestada

A car repair shop charged $80 per hour for labor and $210 for the parts of the car. If the total cost of repair for the car was $490 how many hours did it take to repaie the car.

A) 0.59
B) 2.71
C) 3.50
D) 8.75

Respuesta :

16-07-2017

c(h)=80h+210

80h+210=490 subtract 210 from both sides

80h=280 divide both sides by 80

h=3.5 hours

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