Answer
$y=-e^{-t}+1$
Work Step by Step
$\frac{dy}{dt}=e^{-t};$ $y(0)=0$
$\int dy=-\int-e^{-t}dt$
$y=-e^{-t}+C$
Substitute in the initial condition to solve for $C$
$0=-e^{-0}+C$
$C=1$
$y=-e^{-t}+1$
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