Answer
$\sqrt 10$
Work Step by Step
$\frac{\sqrt -70}{\sqrt -7}=\frac{i\sqrt 70}{i\sqrt 7}=\frac{i}{i}\times\frac{\sqrt 70}{\sqrt 7}=1\times\sqrt \frac{70}{7}=\sqrt 10$
We know that $\sqrt -1=i$, because $i^{2}=-1$.
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