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September 22, 2014

September 22, 2014

Posted by **lan** on Thursday, November 29, 2012 at 3:43pm.

- earth science -
**Damon**, Thursday, November 29, 2012 at 4:19pmx = Xi e^-kt

1/2 = e^-24 k

ln .5 = -24 k

-.693 = -24 k

k = .0289

so

x = 220 e^-.0289*168

= 220 * .00779

= 1.71 grams

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