#### Answer

$-4$

#### Work Step by Step

$x=\log _{5}\left( \dfrac {1}{625}\right) \Rightarrow 5^{x}=\dfrac {1}{625}=5^{-4}\Rightarrow $
$x=-4$

Published by
Pearson

ISBN 10:
013421742X

ISBN 13:
978-0-13421-742-0

$-4$

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