Question

The function f(m) = 0.22m +50, represents the total cost of renting a car as a function of the miles driven. If the total

cost is $142.40, how many miles was the car driven?

Answer 1

The car was driven 420 miles.

f(m) = 0.22m + 50

1. Substitute the total cost into f(m)

142.40 = 0.22m + 50

2. Subtract 50 from both sides

92.4 = 0.22m

3. Divide both sides by 0.22

420 = m