MATH help
posted by HM .
a certain radioactive isotope has a half life of approx 1,300 years .
How many years to the nearest year would be required for a given amount of this isotope to decay to 55% of that amount.
So I am not sure where to put the 1,300
1,300=2600*e^t
or A=x*e^1300

300.00 5percent for 2 years
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