#### Answer

A possible question that would help might be:
" Is 81 a power of 3$?''$

#### Work Step by Step

If you recognize 81 as a power of 3,
$81=3^{4}$,
then you can evaluate the logarithm using the basic property
$\log_{b}b^{x}=x$.
Namely,
$\log_{3}3^{4}=4$
So a possible question that would help might be:
" Is 81 a power of 3$?''$