Answer
$\log_{10}100=2$
Work Step by Step
Since $b^y=x$ is equivalent to $y=\log_bx,$ the given equation, $
10^2=100
,$ is equivalent to
\begin{array}{l}\require{cancel}
\log_{10}100=2
.\end{array}
Note that for $\log_{10}x$, the 10 is implied and is often written as $log(x)$.