#### Answer

$\dfrac{1}{7}$

#### Work Step by Step

RECALL:
(i) $a^{-\frac{m}{n}}=\dfrac{1}{a^{\frac{m}{n}}}$
(ii) $a^{\frac{m}{n}}=\sqrt[n]{a^m}$
Use the rule above to obtain:
$=\dfrac{1}{49^{\frac{1}{2}}}
\\=\dfrac{1}{\sqrt{49}}
\\=\dfrac{1}{7}$

Published by
Pearson

ISBN 10:
0-13417-894-7

ISBN 13:
978-0-13417-894-3

$\dfrac{1}{7}$

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