Answer
$3$
Work Step by Step
RECALL:
$y=a^b \longleftrightarrow \log_a{y}=b$
Let $y=\log_2{8}$.
Using the definition above gives:
\begin{align*}
2^y&=8\\
2^y&=2^3
\end{align*}
Thus, $y=\log_2{8}=3$.
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