Answer
Please see below.
Work Step by Step
The change-of-base property states that$$\log_bM= \frac{\log_aM}{\log_ab}$$So by introducing the new base $e$, we have$$\log e=\log_{10}e=\frac{\log_ee}{\log_e10}=\frac{1}{\ln 10}$$
Precalculus (6th Edition) Blitzer
by Blitzer, Robert F.
Published by
Pearson
ISBN 10:
0-13446-914-3
ISBN 13:
978-0-13446-914-0
Chapter 3 - Section 3.3 - Properties of Logarithms - Exercise Set - Page 477: 129
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