Answer
See below.
Work Step by Step
If $f$ is one-to-one then for all $y=f(x)$ there is only one $x$. Thus, then $f^{-1}(13)=7$.
College Algebra (10th Edition)
by Sullivan, Michael
Published by
Pearson
ISBN 10:
0321979478
ISBN 13:
978-0-32197-947-6
Chapter 6 - Section 6.2 - One-to-One Functions; Inverse Functions - 6.2 Assess Your Understanding - Page 421: 77
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