Answer
23
Work Step by Step
According to the general properties of common logarithms on page 462, $b^{log_{b}x}=x$.
Therefore, $7^{log_{7}23}=23$.
College Algebra (6th Edition)
by Blitzer, Robert F.
Published by
Pearson
ISBN 10:
0-32178-228-3
ISBN 13:
978-0-32178-228-1
Chapter 4 - Exponential and Logarithmic Functions - Exercise Set 4.2 - Page 466: 42
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