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15. Plutonium-239 is the isotope that is most often used in nuclear reactors, and has a half-life of 24,100 years. At the time of the

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15. Plutonium-239 is the isotope that is most often used in nuclear reactors, and has a half-life of 24,100 years. At the time of the 1986 accident at Chernobyl, there were 10 poundsof plutonium-239 on site.a) Find an exponential model that gives the amount of plutonium 239 remaining aftert years.b) How much plutonium remains after 100 years?c) How much plutonium remains after 1000 years?

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