Answer
$x \approx 0.02$
Work Step by Step
RECALL:
$\ln{x}= y \longrightarrow e^y=x$
Use the rule above to obtain:
$e^{-4}=x
\\\dfrac{1}{e^4}=x$
Use a calculator to obtain:
$x=\dfrac{1}{e^4}
\\x=0.01831563889
\\x \approx 0.02$