Radioactive decay The radioactive bismuth isotope 21°BI has a half-life of 5 days. If there is 100 milligrams of 210Bi present at t = 0, then the amount f(t) remaining after t days is given by f(t) = 100(2) 5. (a) How much 210BI remains after 5 days? 10 days? 12.5 days? (b) Sketch the graph of f for 0 sts 30.

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