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a fossilized plant contains 0.0411 milligrams of a particular radioactive substance. after 75 years, it contains 0.0397 milligrams. given that the amount of the substance at time t is given by the formula n(t)= n0e^-kt, where n0 is the initial amount of the substance, what is the half-life of the substance, to the nearest year?
if you can, explain how to get the answer. : )