Answer
$13$
Work Step by Step
Using $a^{m/n}=\sqrt[n]{a^m}=(\sqrt[n]{a})^m$ the given expression, $
169^{1/2}
,$ simplifies to
\begin{array}{l}\require{cancel}
\sqrt{169^1}
\\\\=
\sqrt{169}
\\\\=
\sqrt{(13)^2}
\\\\=
13
.\end{array}
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