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October 23, 2014

Homework Help: Calculus-Modeling Equations

Posted by Kim on Friday, March 6, 2009 at 12:08am.

An unknown radioactive element decays into non-radioactive substances. In 420 days the radioactivity of a sample decreases by 39 percent.

1.What is the half-life of the element?


2.How long will it take for a sample of 100 mg to decay to 46 mg?

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