Homework Help: math

Posted by Amy on Thursday, February 17, 2011 at 5:12pm.

How do I set-up/solve this problem? Please help me.

The half-life of the radioactive isotope gallium-70 is 20 minutes. If the initial amount of gallium-70 is 25 milligrams, when will 10 milligrams be left?

math - Reiny, Thursday, February 17, 2011 at 7:58pm
here is your same question answered.

http://www.jiskha.com/display.cgi?id=1297973911

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