hemist has a 100-gram sample of a radioactive material. He records the amount of radioactive material every week for reeks and obtains the following data. Complete parts (a)-(f). Weight, y (in grams) 100.0 80.1 Week, x 0 1 2 62.4 3 51.7 4 39.9 5 31.7 6 25.2 (a) Treating week, x, as the independent variable, use a graphing utility to fit an exponential functio y= ab* = 100.3991(0.7946)* (Round to four decimal places as needed.) (b) Express the function found in part (a) in the form A(t) = A0 e kt. A(t) = (Round to four decimal places as needed.) ----