In an A.P., given an = 4, d = 2, Sn = -14, find n and a.
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In an A.P., given a = 2, d = 8, Sn = 90, find n and an.
In an A.P., given a = 8, an = 62, Sn = 210, find n and d.
In an A.P., given a = 3, n = 8, S = 192, find d.
In an A.P., given l = 28, S = 144, and there are total 9 terms. Find a.