Answer
$x=3.125$
Work Step by Step
$4e^x=91$
$e^x=\frac{91}{4}$
$\ln e^x=\ln\frac{91}{4}~$ (Using the Inverse Property: $\ln e^x=x$):
$x=\ln\frac{91}{4}=\ln22.75\approx3.125$
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