Answer
$1$
Work Step by Step
RECALL:
(1) $\log_b{M}+\log_b{N}=\log_b{MN}$
(2) $\log_b{M}−\log_b{N}=\log_b{\frac{M}{N}}$
(3) $\log_b{(b^x)}=x$
(4) $\log_b{b}=1$
Write $81$ as $3^4$ to obtain:
$=\frac{1}{4}\log_3{(3^4)}$
Use rule (3) above to obtain:
$=\frac{1}{4} \cdot 4
\\=1$