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ework 6.8 - Exponential Functions Question 2, 6.8.3 HW Score: 13.64%, 3 of 22 points Part 1 of 4 Points: 0 of 3 Save K Strontium-90 is a radioactive material that decays according to the function A(t) = Age 0.0244t, where Ao is the initial amount present and A is the amount present at time t (in years). Assume that a scientist has a sample of 400 grams of strontium-90. (a) What is the decay rate of strontium-90? (b) How much strontium-90 is left after 10 years? (c) When will only 300 grams of strontium-90 be left? (d) What is the half-life of strontium-90? C... (a) The decay rate of strontium-90 is% (Type an integer or a decimal. Include the negative sign for the decay rate.)