Express the equation in logarithmic form:
(a) $e^{x}=4$ is equivalent to $\ln A=B$. Then
\[
A=4
\]
and
\[
B=
\]
(b) $e^{5}=x$ is equivalent to $\ln C=D$. Then
\[
\text { C }=
\]
and
\[
D=
\]

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$e^{5}=x$ can be rewritten in logarithmic form as $\ln x = 5$. So, $C=x$ and $D=5$.

Steps

Step 1 ：$e^{x}=4$ can be rewritten in logarithmic form as $\ln 4 = x$. So, $A=4$ and $B=x$.

Step 2 ：$e^{5}=x$ can be rewritten in logarithmic form as $\ln x = 5$. So, $C=x$ and $D=5$.