a. 60 b. 16 13. What is the 6th term of the geometric sequence 2, 4, 8, ...? 20 b. 64 0 C. 128 d. 32 a. 46 f 7 14. What is the sum of the geometric sequence where the first term is 5/2, the last term is - 20 and the common ratio is - 2 ? a. -12.5 b. 12.5 C. 15.2 d. 51.2​