Solve -10*f + 7*f + 20 = -4*u, 5 = -5*f - u for f.
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What is the h'th term of 23, 12, -15, -64, -141, -252?
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What is the u'th term of -231, -215, -181, -123, -35?
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What is the p'th term of 299, 598, 897, 1196?
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What is the y'th term of -35, -147, -333, -593, -927, -1335, -1817?
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What is the n'th term of -18, -19, -26, -45, -82, -143, -234, -361?
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What is the c'th term of 35, 70, 105?
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