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October 20, 2014

October 20, 2014

Posted by **Heather** on Wednesday, January 11, 2012 at 9:07pm.

- AP Environmental Science (URGENT) -
**Steve**, Thursday, January 12, 2012 at 10:25amsince 1/16 = (1/2)^4

It will take 4 half-lives to decay that far.

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