A piece of charcoal is found to contain 39% of the element B that it originally had. (a) When did the tree from which the charcoal came die? Use 5500 years as the half-life of the element B. (b) Using a graphing utility, graph the relation between the percentage of the element B remaining and time. (c) Using INTERSECT, determine the time that elapses until half of the the element B remains. (d) Verify the answer found in part (a). (a) The tree died 7471 years ago. (Round to the nearest whole number as needed.) (b) Choose the correct graph below. The graphing window is [0,40000,5000] by [0,1,0.2]. A. B. (c) The time that elapses until half of the element B remains is 7471 years. (Round to the nearest whole number as needed.) C.