In 2006, the murder of Alexander Litvinenko, a Russian dissident, was thought to be by poisoning from the rare and highly radioactive element polonium-210 (210P0). The half-life of 210PO is 138.4 yr. If 0.1 mg of 210PO is present in a sample then |A(t) = 0.1 and interpret the meaning in context. Round to 3 decimal places if necessary. t/138.4 gives the amount A(t) (in mg) present after t years. Evaluate the function for the given values of t a. A(138.4) b. A(276.8) C. A(500)

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