5.8.3Question HelpStrontium-90 is a radioactive material that decays according to the function A(t)=A 0 e^ -0.0244 where A 0 is the initial amount present and A is the amount present at time 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 strontium90 is left after 10 years?(c) When will only 100 grams of strontium-90 be let?(d) What is the half-site of strontium-90