Solve the Problem $D$ Is $f ( x ) = \frac { x } { 2 } - 8$

Multiple Choice

Solve the problem.
-A size 38 dress in Country C is size 11 in Country D. A function that converts dress sizes in Country C to those in Country $D$ is $f ( x ) = \frac { x } { 2 } - 8$ . Find a formula for the inverse of the function described.

A) $f ^ { - 1 } ( x ) = 2 ( x - 8 )$
B) $\mathrm { f } ^ { - 1 } ( \mathrm { x } ) = 2 \mathrm { x } + 8$
C) $\mathrm { f } ^ { - 1 } ( \mathrm { x } ) = \mathrm { x } + 8$
D) $f ^ { - 1 } ( x ) = 2 ( x + 8 )$