The half-life of bismuth-210, 210Bi, is 5 days. (a) If a sample has a mass of 232 mg, find the amount remaining after 15 days.  (ALREADY SOLVED)   (b) Find the amount remaining after t days. (ALREADY SOLVED)   (c) Estimate the amount remaining after 3 weeks. (Round your answer to one decimal place.)  (ALREADY SOLVED)   (d) Use a graph to estimate the time required for the mass to be reduced to 1 mg. (A graphing calculator is recommended. Round your answer to one decimal place.) (NEEDS TO  BE SOLVED)

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