Posted by Monica on Monday, June 13, 2011 at 10:40pm.
30 = 40e^10k
.75 = e^10k
10k = ln.75
k = ln.75/10 = -.028768
then
1/2 = e^-.028768t
- .028768t = ln .5
t = ln .5/-.028768 = 24.09
the half-life is appr. 24.1 hours
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