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OpenStudy (anonymous):
The amount N(t) of radioactive material at time t, measured in years, is governed by the differential equation d/dt N(t) = kN(t), where k is a negative constant. Suppose two measurements of a sample of a radioactive substance were taken, where it was found that in 1985, 98.34% of the original amount measured in 1975 remained. How much of the sample will remain in 2050?
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