Solve 3 = -t - d + 2*d, -2*t + 5*d = 15 for t.
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What is the a'th term of 72, 150, 220, 276, 312, 322?
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What is the s'th term of 19, -2, -33, -74, -125, -186, -257?
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What is the u'th term of 6, 10, 38, 102, 214, 386, 630, 958?
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What is the t'th term of 67, 104, 117, 106, 71?
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What is the v'th term of 11, 37, 89, 173, 295, 461, 677, 949?
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What is the d'th term of 392, 412, 446, 494, 556, 632?
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