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# A sample of a radioactive isotope had an initial mass of 730 mg in 2000 and decays exponentially over time. A

A sample of a radioactive isotope had an initial mass of 730 mg in

2000 and decays exponentially over time. A measurement in the year 2002

found that the sample’s mass had decayed to 510 mg. What would be the

expected mass of the sample in the year 2011, to the nearest whole number?