Find a formula for the inverse of the function described below.
-A size 44 dress in Country C is size 2 in Country D. A function that converts dress sizes in Country C to those in Country D is $f ( x ) = \frac { x } { 2 } - 20$.
A) $f ^ { - 1 } ( x ) = x + 20$
B) $\mathrm { f } ^ { - 1 } ( \mathrm { x } ) = 2 \mathrm { x } + 20$
C) $f ^ { - 1 } ( x ) = 2 ( x + 20 )$
D) $f ^ { - 1 } ( x ) = 2 ( x - 20 )$

Question

Quizplus · Accepted Answer

To find the inverse, solve $y = \frac{x}{2} - 20$ for $x$: $x = 2(y + 20)$. Thus, $f^{-1}(x) = 2(x + 20)$.

Find a Formula for the Inverse of the Function Described f(x)=x2−20f ( x ) = \frac { x } { 2 } - 20f(x)=2x​−20

Find a Formula for the Inverse of the Function Described $f ( x ) = \frac { x } { 2 } - 20$