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A certain nuclear power plant produces radioactive waste in the form of strontium-90 at the constant rate of 500 pounds per year. The waste decays exponentially with a half life of 28 years. How much of the radioactive waste from the nuclear plant will be present after 140 years? (hint: Think of this as a survival and renewal problem)

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Let the decay model be A(t) = A0.e^-kt

Since half-life is 28 years, we have A(t)/A0 ...

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