Answer
$1$
Work Step by Step
RECALL:
(1) $\log_a{P} - \log_a{Q}=\log_a{\left(\frac{P}{Q}\right)}$
(2) $\log_a{a} = 1$
(3) $\log_a{(a^n)}=n$
Use rule (1) above to obtain:
$\log_6{18} - \log_6{3} = \log_6{(\frac{18}{3})}=\log_6{6}$
Use rule (2) above to obtain:
$\log_6{6} = 1$