Find a formula for the inverse of the function described below.
-A size 4 dress in Country $C$ is size 42 in Country D. A function that converts dress sizes in Country $C$ to those in Country $D$ is $f ( x ) = x + 38$.
A) $f ^ { - 1 } ( x ) = x - 38$
B) $f ^ { - 1 } ( x ) = \frac { x } { - 38 }$
C) $\mathrm { f } ^ { - 1 } ( \mathrm { x } ) = \mathrm { x } + 38$
D) $f ^ { - 1 } ( x ) = \frac { x } { 38 }$

Question

Quizplus · Accepted Answer

The inverse function $f^{-1}(x)$ undoes the action of the original function $f(x) = x + 38$, so to find the original size in Country $C$, you subtract 38 from the size in Country $D$, resulting in $f^{-1}(x) = x - 38$.

Find a Formula for the Inverse of the Function Described CCC

Find a Formula for the Inverse of the Function Described $C$