$32 ^ { \circ }$ Fahrenheit = $0 ^ { \circ }$

Multiple Choice

$32 ^ { \circ }$ Fahrenheit = $0 ^ { \circ }$ Celsius. A function that converts temperatures in Celsius to those in Fahrenheit is $f ( x ) = \frac { 9 } { 5 } x + 32$ Fahrenheit. Find a formula for the inverse of this function.

A) $f ^ { - 1 } ( x ) = x + 32$
B) $f ^ { - 1 } ( x ) = \frac { 5 } { 9 } ( x - 32 )$
C) $f ^ { - 1 } ( x ) = \frac { 5 } { 9 } ( x + 32 )$
D) $f ^ { - 1 } ( x ) = \frac { 9 } { 5 } x + 32$