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

question 259

Multiple Choice

Find a formula for the inverse of the function described below.
-A size 4 dress in Country $C$ is size 40 in Country D. A function that converts dress sizes in Country C to those in Country D is $f ( x ) = 2 ( x + 16 )$ .

• A) \(\mathrm { f } ^ { - 1 } ( \mathrm { x } ) = \frac { \mathrm { x } } { 2 } + 16\)
• B) \(\mathrm { f } ^ { - 1 } ( \mathrm { x } ) = \mathrm { x } - 16\)
• C) \(\mathrm { f } ^ { - 1 } ( \mathrm { x } ) = \frac { \mathrm { x } } { 2 } - 16\)
• D) \(f ^ { - 1 } ( x ) = \frac { x - 16 } { 2 }\)

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