Answer
1.7959
Work Step by Step
For all positive numbers $a$, where $a\ne1$, and all positive numbers $x$, we know that $y=log_{a}x$ means the same as $x=a^{y}$.
Therefore, $log_{5}18=x$ means the same as $5^{x}=18$.
By using a calculator to approximate, we know that $x= 1.7959$, because $5^{1.7959}=18$.