Answer
D. $\frac{1}{625}$
Work Step by Step
We know that $a^{−n}=\frac{1}{a^{n}}$ (as long as a is a nonzero real number and n is an integer).
Therefore, $5^{-4}=\frac{1}{5^{4}}=\frac{1}{5\times5\times5\times5}=\frac{1}{625}$.
Algebra: A Combined Approach (4th Edition)
by Martin-Gay, Elayn
Published by
Pearson
ISBN 10:
0321726391
ISBN 13:
978-0-32172-639-1
Chapter 5 - Section 5.2 - Negative Exponents and Scientific Notation - Vocabulary and Readiness Check - Page 353: 2
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