Answer
$\log_5{r}-\log_5{s}$
Work Step by Step
Recall the quotient property of logarithms (pg. 462):
$\log_b{\frac{m}{n}}=\log_b{m}-\log_b{n}$
We apply this to the given expression to obtain:
$\log_5{\frac{r}{s}}=\log_5{r}-\log_5{s}$