To find the average of a set of numbers, you add them together and then divide by the total number of values. In this case, the sum of 8, 18, and 28 is 54. Divide 54 by the total number of values (3 in this case) to get the average, which is 18.
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8, 13, 18, 23, 28, etc.
Halfway between 18 and 28 is (18 + 28) ÷ 2 = 23.
If the term number is n, then the nth term is 10(n-1) +8.
28 + 18 = 46