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Mathematics, 11.03.2021 21:50 winterblanco

A sample of a radioactive isotope had an initial mass of 550 mg in the year 2009 and decays exponentially over time. A measurement in the year 2015 found that the sample's mass had decayed to 90 mg. What would be the expected mass of the sample in the year 2020, to the nearest whole number?

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