Answer
$log_{27}(81)=\frac{4}{3}$
Work Step by Step
Use the definition $b^y=x$ is equivalent to $y=log_b(x)$, we have $27^{4/3}=81$ is equivalent to $\frac{4}{3}=log_{27}(81)$ or $log_{27}(81)=\frac{4}{3}$
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