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February 1, 2015

February 1, 2015

Posted by **Andrea** on Wednesday, December 12, 2012 at 10:42am.

- algebra -
**Steve**, Wednesday, December 12, 2012 at 10:51amusing mg as the basis,

9 = 75*(1/2)^7x

x = 0.437 hrs

makes sense, since 9/75 is about 1/8 or 3 half-lives 3/7 =0.43

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