(10] Strontium-90 is a radioactive material that decays according to the equation -0.0244t A= A ·e time t (in years). a) where A; is the initial amount present and A is the amount present at What is the half-life of strontium-90? b) Determine how long it takes for 100 grams of strontium-90 to decay to 10 grams.

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