Answer
13
Work Step by Step
Apply the
Basic Logarithmic Property: $b^{\log_{b}x}=x$
and the fact that $\log x=\log_{10}x$
(common logarithm has base 10)$:$
$10^{\mathrm{l}\mathrm{o}\mathrm{g}13}=10^{\mathrm{l}\mathrm{o}\mathrm{g}_{10}13}=13$