One of the main contaminants of a nuclear accident, such as that at Chernobyl, is strontium-90, which decays exponentially at a rate of approximately 2.5% per year.
(a) Write the ratio of strontium-90 remaining, p , as a function of years, t , since the nuclear accident.

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p(t)=?

so it's just the last part? e^-....

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