Answer
${\frac{1}{2}}$
Work Step by Step
If $b\gt0$ and $b\ne1$, then $y=log_{b}x$ means $x=b^{y}$ for every $x\gt0$ and every real number $y$.
Therefore, $log_{7}\sqrt 7=\frac{1}{2}$.
We know this because $7^{\frac{1}{2}}=\sqrt 7$.
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