Answer
$16$
Work Step by Step
Recall that $a^{x/y}=(\sqrt[y] {a})^x$.
Use these rules to simplify: $64^{2/3}=(\sqrt[3]{64})^2=4^2=16$
(See my explanation given to exercise 54 if you've forgotten how to find a cube root.)
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 P - Review Exercises - Page 143: 67
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