Renting a truck for a day costs $75, plus 0.50 for every mile the truck is driven. Function f represents the cost of a day's rental in dollars as a function of the total miles driven x. Which function represents the total miles driven as a function of the daily rental cost?
A-F^-1(x)=2x+150
B-F^-1(x)=2x-150
C-F^-1(x)=0.5x+75
D-F^-1(x)=0.5x-75