Solve 2*f = -8, -5*s + 4*f + 5 + 21 = 0 for s.
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What is the u'th term of 18, -9, -54, -123, -222, -357, -534?
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What is the a'th term of 19, 63, 129, 217, 327?
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What is the g'th term of 24, 205, 682, 1599, 3100, 5329, 8430, 12547?
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What is the f'th term of -2, -53, -190, -455, -890, -1537, -2438, -3635?
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What is the k'th term of 143, 601, 1371, 2459, 3871, 5613, 7691?
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What is the k'th term of 2110, 2111, 2110, 2107, 2102?
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