Answer
3
Work Step by Step
$81^{\frac{1}{4}}=\sqrt[4] 81=3$
We know this because $3^{4}=3\times3\times3\times3=81$
Intermediate Algebra (6th Edition)
by Martin-Gay, Elayn
Published by
Pearson
ISBN 10:
0321785045
ISBN 13:
978-0-32178-504-6
Chapter 7 - Section 7.2 - Rational Exponents - Exercise Set - Page 424: 8
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