the answer is 12
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12
20 + 3 = 23 23 + 5 = 28 28 / 2 = 14 14 + 3 = 17 17 + 5 = 22 22 / 2 = 11 11 + 3 = 14 14 + 5 = 19 19 / 2 = 9.5
add and divide by 4 average is 49
5, 8, 11, 14, 17 = has a1 = 5, d = 3, and n = 5.The explicit formula is an = 5 + (n - 1)·3
3n - 1