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April 19, 2015

Posted by **Bree** on Tuesday, December 21, 2010 at 6:59pm.

- Science -
**Damon**, Tuesday, December 21, 2010 at 9:01pm1/2 = e^-5k

ln .5 = -5 k

k = .1386

so

x = Xo e^-.1386 t

.001 = e^-.1386 t

-6.91 = -.1386 t

t = 49.8 days

check

about 10 five day periods

.5^10 = .000976

close enough to .001

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