Question 1083384
You have your formula:   {{{A=200*e^(-0.005t)}}}
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You are given the independent variable values to use:
 {{{system(t=0,or,t=800)}}}


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Make the substitutions and evaluate the result for each:



 {{{200*e^(-0.005*0)=200*e^0=200*1=200}}},
which is not complicated... 



AND for the other, use a hand-held calculator for {{{200*e^(-0.005*800)=200*e^(-4)}}}