Answer
$\dfrac{49}{4}$
Work Step by Step
Using laws of exponents, then,
\begin{array}{l}
\left( \dfrac{2}{7} \right)^{-2}
\\\\=
\left( \dfrac{7}{2} \right)^{2}
\\\\=
\dfrac{49}{4}
.\end{array}
Intermediate Algebra (6th Edition)
by Martin-Gay, Elayn
Published by
Pearson
ISBN 10:
0321785045
ISBN 13:
978-0-32178-504-6
Chapter 5 - Cumulative Review - Page 334: 39c
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