Answer
$f(4)=20$
$f^{-1}(15)=3$
Work Step by Step
We have
$$
f(4)=5 \cdot 4=20 .
$$
To find $f^{-1}(15)$, we find the value of $x$ giving $f(x)=15$. If $15=5 x$, then $x=15 / 5=3$. Thus, $f^{-1}(15)=3$.
Functions Modeling Change: A Preparation for Calculus, 5th Edition
by Connally, Eric; Hughes-Hallett, Deborah; Gleason, Andrew M.; Cheifetz, Phil C.
Published by
Wiley
ISBN 10:
1118583191
ISBN 13:
978-1-11858-319-7
Chapter 2 - Functions - 2.5 Preview of Composite and Inverse Functions - Exercises and Problems for Section 2.5 - Exercises and Problems - Page 102: 28
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