math
posted by rachel .
Radioactive radium has a halflife of approximately 1599 years. What percent of a given amount remains after 100 years?

didn't I do this once? http://www.jiskha.com/display.cgi?id=1298595200

qs
posted by rachel .
Radioactive radium has a halflife of approximately 1599 years. What percent of a given amount remains after 100 years?
didn't I do this once? http://www.jiskha.com/display.cgi?id=1298595200
qs