Given two terms in artimetic sequence find the common difference, the 52 term, and the explicit formula. a15=139 and a30=259

139, 149, 159, 169, 179, 189, 199, 209, 219, 229, 239, 249, 259.

The common difference is 13.

Let n = 52

Let d = common difference

a_52 = 139 + (52 - 1)(13)

a_52 = 139 + (51)(13)

a_52 = 139 + 663

a_52 = 802

the correct answer is x/3+10≥32

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