#### Answer

$4$

#### Work Step by Step

$\log _{2}\left( \log _{2}x\right) =1\Rightarrow \log _{2}x=2^{1}\Rightarrow x=2^{2^1}=2^{2}=4$

Published by
Pearson

ISBN 10:
013421742X

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

$4$

$\log _{2}\left( \log _{2}x\right) =1\Rightarrow \log _{2}x=2^{1}\Rightarrow x=2^{2^1}=2^{2}=4$

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