#### Answer

$\frac{8}{9}$

#### Work Step by Step

We know that $\sqrt \frac{64}{81}=\frac{8}{9}$, because $(\frac{8}{9})^{2}=\frac{8}{9}\times\frac{8}{9}=\frac{8\times8}{9\times9}=\frac{64}{81}$.

Published by
Pearson

ISBN 10:
0321969359

ISBN 13:
978-0-32196-935-4

$\frac{8}{9}$

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