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A car rental agency charges $50 per week plus $0.50 per mile to rent a car. What is the weekly cost to rent the car, f, as a function of the number of miles driven during the week, x. How many miles did you drive during the week if the weekly cost to rent the car was $100?

Respuesta :

sqdancefan
A) The cost in dollars is given as 50 + 0.50x, so ...
  f(x) = 0.50x +50

B) You want to find x for f(x) = 100. Substitute the given numbers and solve for x.
  100 = 0.50x +50
  50 = 0.50x
  50/0.50 = x
  100 = x
You drove 100 miles during the week if the cost was $100.

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