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In 1999, a sample of a radioactive substance had a mass of 200 milligrams. Since then, the sample has decayed by 2.1% each year.
Lett be the number of years since 1999. Let y be the mass of the substance in milligrams.
Write an exponential function showing the relationship between y and t.

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dianaprincestan
Answer: y=200(0.979)^t

Formula for exponential decay is y(1-r)^t.
Plug in the values given and we get 200(1-0.021)^t

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