2. [8.34/12.5 Points] DETAILS PREVIOUS ANSWERS LARPCALC10 3.1.063. 15(+)24,100 Let Q represent a mass of radioactive plutonium (239Pu) (in grams), whose half-life is 24,100 years. The quantity of plutonium present after t years is Q = 15 (a) Determine the initial quantity (when t = 0). 15 9 (b) Determine the quantity present after 60,000 years. (Round your answer to two decimal places.) 3.03 X 9 (c) Use a graphing utility to graph the function over the interval t 0 to t = 150,000.