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January 27, 2015

January 27, 2015

Posted by **lance** on Friday, December 16, 2011 at 2:46pm.

- algebra -
**Damon**, Friday, December 16, 2011 at 3:39pmx = A e^-kt

if x/A = 0.5, t = 2.52*10^5

.5 = e^-k(2.52*10^5)

ln .5 = -.693 = -2.52*10^5 k

k = 2.75*10^-6

0.984 = e^-2.75*-10^-6 t

t = 5863 years

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