Question

An electrical company uses the function f(h) = 15h + 75 to calculate the total repair bill, f(h), for h number of hours worked. Find h if f(h) = $225.

10 hours
15 hours
3,375 hours
3,450 hours

Answer 1

10 hours

Explanation:

f(h) = 15h + 75 = 225

subtracting 75 from both sides and simplifying:

15h +75-75 = 225-75 =150

15h = 150

Dividing both sides by 15:

15h/15 = 150/15

h = 10 hours