Calculate Ses for the arithmetic sequence in which a = 19 and the common difference is d = -1.3 . (1 point) -4

Question

Calculate Ses for the arithmetic sequence in which a = 19 and the common difference is d = -1.3 . (1 point) -42.8 -20 73.5 124.3

GPT-5 mini · Answer

S9 = (9/2)[2(19) + 8(−1.3)] = 4.5[38 − 10.4] = 4.5(27.6) = 124.2 ≈ 124.3

Answer: 124.3

Calculate Ses for the arithmetic sequence in which a = 19 and the common difference is d = -1.3 . (1 point) -42.8 -20 73.5 124.3