Answer
$e^{-0.693...}=\frac{1}{2}$
Work Step by Step
$\ln\frac{1}{2}=-0.693...$
$e^{\ln\frac{1}{2}}=e^{-0.693...}$ (using the Inverse Property, page 375):
$\frac{1}{2}=e^{-0.693...}$
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