SOLUTION: The number of grams of a certain radioactive substance present at time t is given by the formula A=200e^-0.005t, where t is the number of years. Find the number of grams that are p

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Question 1083384: The number of grams of a certain radioactive substance present at time t is given by the formula A=200e^-0.005t, where t is the number of years. Find the number of grams that are present at time t=0 and at time t=800
Answer by josgarithmetic(39617) About Me  (Show Source):
You can put this solution on YOUR website!
You have your formula: A=200%2Ae%5E%28-0.005t%29
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You are given the independent variable values to use:
system%28t=0%2Cor%2Ct=800%29

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Make the substitutions and evaluate the result for each:


200%2Ae%5E%28-0.005%2A0%29=200%2Ae%5E0=200%2A1=200,
which is not complicated...


AND for the other, use a hand-held calculator for 200%2Ae%5E%28-0.005%2A800%29=200%2Ae%5E%28-4%29