Homework Help: math

Posted by rachel on Thursday, February 24, 2011 at 7:59pm.

Radioactive radium has a half-life of approximately 1599 years. What percent of a given amount remains after 100 years?

math - bobpursley, Thursday, February 24, 2011 at 8:31pm
didn't I do this once? http://www.jiskha.com/display.cgi?id=1298595200

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