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 beginning of the time period. How much should be acquir

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Question 44019: 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 beginning of the time period. How much should be acquired now the have 40 grams remaining after 3 days?
A. 47.9 gm
B. 48.8 gm
C. 61.6 gm
D. 68.6 gm
Another brainbuster, any help out there?
Answer by stanbon(75887) About Me  (Show Source):
You can put this solution on YOUR website!
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 beginning of the time period. How much should be acquired now the have 40 grams remaining after 3 days?
A=Ao e^-0.18t
40 = Ao e^-0.18(3)
40 = Ao (0.58274825...)
Ao=68.64 grams
Cheers,
Stan H.