Answer
See below.
Work Step by Step
a) By plugging in $A_0=100,n=3$ into the formula: $A(3)=100e^{-0.35\cdot3}=100e^{-1.05}\approx34.99$
b) By plugging in $A_0=100,n=10$ into the formula: $A(10)=100e^{-0.35\cdot10}=100e^{-3.5}\approx3.02$
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