Answer
$\sqrt{1}+\sqrt{2}+\sqrt{3}+\sqrt{4}+\sqrt{5}$
Work Step by Step
We expand the sigma notation by writing $\sqrt{i}$ as $i$ increases from 1 to 5:
$\displaystyle \sum_{i=1}^{5}\sqrt{i}=\sqrt{1}+\sqrt{2}+\sqrt{3}+\sqrt{4}+\sqrt{5}$
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