In an A.P., given d = 5, S9 = 75, find a and a9.
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In an A.P., given a12 = 37, d = 3, find a and S12.
In an A.P., given a3 = 15, S10 = 125, find d and a10.
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.