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September 20, 2014

September 20, 2014

Posted by **hannah** on Tuesday, November 12, 2013 at 6:52pm.

- math -
**Kuai**, Wednesday, November 13, 2013 at 12:36amPo = Poe^kt

1/2 = e^5730k

Ln(1/2) = Lne^5730k

Ln(1/2) = 5730k

K = ln(1/2)/5730

Poe^ln(1/2)/5730 *t

.80P0 = Poe^ln(1/2)/5730 *t

.8 = e^ln(1/5)/5730 t

ln(.8) = ln(.5)/5730t lne

ln(.8) = ln(.5)/ 5730 t

t = 5730ln(.8)/ln(.5)

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