SOLUTION: the amount of a radioactive tracer remaining after t days is given by A=Ao e^(-0.18t), where Ao Is the starting amount at the begining of the time period. How much should be acqui

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Question 46759: the amount of a radioactive tracer remaining after t days is given by
A=Ao e^(-0.18t), where Ao Is the starting amount at the begining of the time period. How much should be acquired now to have 40 grams remaining after 3 days.
40=Ao e^(-0.18t)
t=3
not sure what to do next.
Answer by adamchapman(301) About Me  (Show Source):
You can put this solution on YOUR website!
I will start where you left off:
40=A%5B0%5D+e%5E%28-0.18t%29+
t=3
40=A%5B0%5D+e%5E%28-0.54%29+
40%2F%28e%5E%28-0.54%29%29=A%5B0%5D+
A%5B0%5D+=68.6grams

I hope this helps,
Adam
P.S. please visit my website, it may be helpful to you. The address is www.geocities.com/quibowibbler