Answer
$$\frac{1}{3}$$
Work Step by Step
$\frac{\sqrt{-8}}{\sqrt{-72}}=\frac{i\sqrt{8}}{i\sqrt{72}}$
$(\frac{i}{i})(\sqrt {\frac{8}{72}})$
$\sqrt{\frac{1}{9}}$
$$\frac{1}{3}$$
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