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A sample of radioactive material with decay constant 0.05 is st K decaying at a rate R(t) = -4e-0.05t grams per year How many grams

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A sample of radioactive material with decay constant 0.05 is st K decaying at a rate R(t) = -4e-0.05t grams per year How many grams of this material decayed after the first 20 years? Write the definite integral that will be used to estimate the decay. The definite integral that will be used is dt

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