Answer
$3.35$ mg, $0.45$ mg.
Work Step by Step
If $D(h)=5e^{-0.4h}$, then if $h=1$, $D(h)=5e^{-0.4\cdot1}=3.35$ mg.
If $D(h)=5e^{-0.4h}$, then if $h=6$, $D(h)=5e^{-0.4\cdot6}=0.45$ mg.
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