Answer
True.
Work Step by Step
$\ln x$ means $\log_{e}x.$
Recognize $81$ as $9^{2}$
$\ln 81=\ln 9^{2}=\qquad$... apply $\log_{a}M^{p}=p\cdot\log_{a}M$
$=2\ln 9$
The statement is true.
Elementary and Intermediate Algebra: Concepts & Applications (6th Edition)
by Bittinger, Marvin L.; Ellenbogen, David J.; Johnson, Barbara L.
Published by
Pearson
ISBN 10:
0-32184-874-8
ISBN 13:
978-0-32184-874-1
Chapter 12 - Exponential Functions and Logarithmic Functions - 12.5 Common Logarithms and Natural Logarithms - 12.5 Exercise Set - Page 818: 7
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