8. Strontium-90 is a radioactive material that decays according to the function A(t) = Ane-0.0244t where A, is the initial amount present and A is the amount present at time t ( in years. Assume that a scientist has a sample of 500 grams of Strontium-90. (round off your answer to two decimal places) a. How much Strontium-90 is left after 10 years days? b. When will 400 grams of Strontium-90 be left?

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