Answer
$$2$$
Work Step by Step
We simplify as follows:
$$\log_2 (\log_3 81)= \log_2 ( \log_33^4)= \log_2 (4\log_33)=\log_2(4(1))=\log_24=\log_22^2=2\log_22=2(1)=2$$
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 - Mid-Chapter Check Point - Page 477: 14
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