Answer
9
Work Step by Step
$\ln e^x = x$, since $\ln e^x$ can be rewritten as $\log_ee^x$ and $e$ must be raised to a power of $x$ to become $e^x$.
$\ln e^9$ is in the form $\ln e^x$, so $x=9$.
Algebra: A Combined Approach (4th Edition)
by Martin-Gay, Elayn
Published by
Pearson
ISBN 10:
0321726391
ISBN 13:
978-0-32172-639-1
Chapter 12 - Section 12.7 - Common Logarithms, Natural Logarithms, and Change of Base - Practice - Page 886: 8
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