Mathematics, 14.05.2021 01:00 whitethunder05

A sample of a radioactive isotope had an initial mass of 130 mg in the year 2010 and decays exponentially over time. A measurement in the year 2012 found that the sample's mass had decayed to 80 mg. What would be the expected mass of the sample in the year 2021, to the nearest whole number?

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A sample of a radioactive isotope had an initial mass of 130 mg in the year 2010 and decays exponent...