Mathematics, 21.09.2021 05:10, joyelewis58

Element X is a radioactive isotope such that every 21 years, its mass decreases by half. Given that the initial mass of a sample of Element X is 1800 grams, how much of the
element would remain after 28 years, to the nearest whole number?

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Element X is a radioactive isotope such that every 21 years, its mass decreases by half. Given tha...