Bob Buys a Car That Gets 12 Miles Per Gallon $f(x)$

Bob buys a car that gets 12 miles per gallon of gasoline. Create a function, $f(x)$ , that represents the number of miles that Bob can travel with $\mathrm{x}$ gallons of gasoline.

A) $f(x) =x+12$
B) $f(x) =\frac{12}{x}$
C) $f(x) =12 x$
D) $f(x) =\frac{x}{12}$