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#1
Dec 27 2013 04:39pm


I know the first part is 100. (It will take 100 days for only 1/32 to remain) but I dont know how to find the second part, which is the rate of decay. Pretty stumped.

Please halp!!!
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#2
Dec 27 2013 04:47pm
1/32 = (.5)^(x/20)

take derivative
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