#### Answer

$3$

#### Work Step by Step

$\frac{1}{\sqrt 8} \times \sqrt {72}=\frac{\sqrt {72}}{\sqrt {8}} = \sqrt {\frac{72}{8}} = \sqrt {9} = 3$

Published by
Pearson

ISBN 10:
013421742X

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

$3$

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