4)lodiline -131 is radioactive material that decays according to the function A(t)= A0e^(-0.087t) where A0 is the amount present and A is the amount present after t days. a) approximate the half-life of iodine-131. b)if a scientist has a sample of 100grams of iodine-131, how long until there is only 10 grams remaining?
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