Answer
$\approx 1.796$
Work Step by Step
RECALL:
The change-of-base formula for logarithms:
$\log_a{b}=\dfrac{\log{b}}{\log{a}}$
Use a calculator and the formula above to obtain:
$\log_5{18} = \dfrac{\log{18}}{\log{5}} \approx 1.796$