Manny is a plumber and charges $50 when he visits a client and $30 per hour for every hour he works. His bill can be expressed as a function of hours, x, with the function

Question

Manny is a plumber and charges $50 when he visits a client and $30 per hour for every hour he works. His bill can be expressed as a function of hours, x, with the function
f(x)= 50 +30x. Which statement explains the meaning of the inverse of the function?

A)Total bill as a function of the number of hours  
B)Cost per hour as a function of the total bill  
C)Number of hours as a function of the total bill  
D)Total bill as a function of the cost per hour

drwls · Answer

The inverse function would be choice (C), since the two variables are total cost and number of hours.