Solve the Problem $D$ Is $f ( x ) = 2 ( x + 12 )$

Multiple Choice

Solve the problem.
-A size 10 dress in Country C is size 44 in Country D. A function that converts dress sizes in Country C to those in Country $D$ is $f ( x ) = 2 ( x + 12 )$ . Find a formula for the inverse of the function described.

A) $f ^ { - 1 } ( x ) = \frac { x - 12 } { 2 }$
B) $f ^ { - 1 } ( x ) = x - 12$
C) $\mathrm { f } ^ { - 1 } ( \mathrm { x } ) = \frac { \mathrm { x } } { 2 } + 12$
D) $f ^ { - 1 } ( x ) = \frac { x } { 2 } - 12$