Answer
$k = \ln m$
Work Step by Step
$Write$ $the$ $equation$ $in$ $logarithmic$ $form:$
$e^k = m$
Exponential form to natural log form: $e^b = a \rightarrow \ln a = b$ [e stands for euler's number]
Plug in $k$ for b and $m$ for a
$$e^k = m \rightarrow \ln m = k$$
$$k = \ln m$$
