Answer
See below.
Work Step by Step
By plugging in $h=1$ into the formula: $D(1)=5e^{-0.4\cdot1}=5e^{-0.4}\approx3.35$
By plugging in $h=6$ into the formula: $D(1)=5e^{-0.4\cdot6}=5e^{-2.4}\approx0.45$
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