Answer
$2$
Work Step by Step
Use $16=2^4$.
$\sqrt[4]{16}=\sqrt[4]{2^4}=|2|=2$
Hence, the correct answer is $2$.
Precalculus (10th Edition)
by Sullivan, Michael
Published by
Pearson
ISBN 10:
0-32197-907-9
ISBN 13:
978-0-32197-907-0
Appendix A - Review - A.10 nth Roots; Rational Exponents - A.10 Assess Your Understanding - Page A88: 12
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