The amount of a certain radioactive material (in grams) in a storage facility at time t is given by C(t)=81 e 19t, where time is measured in years. (a) How much of the radioactive material was present initially? (b) What is the half-life of the radioactive material? (Hint: For what value of t is C(t) = 40.5?) (a) Initially, there were grams of the radioactive material. (Round to two decimal places as needed.) (...)

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