Sa Strontium-90 is a radioactive material that decays according to the function A(t) = Ap e - 0-02441 ", where Ao is the initial amount present and A is the amount pres at time t (in years). Assume that a scientist has a sample of 800 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 200 grams of strontium-90 be left? (d) What is the half-life of strontium-90? (a) The decay rate of strontium-90 is%. (Type an integer or a decimal. Include the negative sign for the decay rate.) Help me solve this View an example Get more help Clear all Check answer hp 144 DRI prt sc delete $ & 9 backspace 4 6 R T O P F G H K pause C B N M Ctri