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Mathematics, 11.03.2021 21:30 kellysmith45

A sample of a radioactive isotope had an initial mass of 480 mg in the year 2009 and decays exponentially over time. A measurement in the year 2011 found that the
sample's mass had decayed to 390 mg. What would be the expected mass of the
sample in the year 2016, to the nearest whole number?

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