Tuesday
September 16, 2014

Homework Help: college algebra

Posted by Dee on Monday, November 18, 2013 at 7:38pm.

Use a calculator to help solve the problem.

An isotope of lead, 201Pb, has a half-life of 8.4 hours. How many hours ago was there 40% more of the substance? (Round your answer to one decimal place.)


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