Sunday

April 20, 2014

April 20, 2014

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

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.)

____hr

- college algebra -
**Daniela**, Saturday, April 19, 2014 at 2:50pm?

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