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July 31, 2015

Homework Help: calculus

Posted by kela on Friday, November 9, 2012 at 6:00pm.

A sample of a radioactive substance decayed to 94.5% of its original amount after a year. (Round your answers to two decimal places.)
(a) What is the half-life of the substance?
(b) How long would it take the sample to decay to 65% of its original amount?

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