Solve 0*f + 5*d = f + 15, 0 = 5*f - 4*d + 12 for f.
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What is the u'th term of -29, -15, 11, 55, 123, 221?
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What is the x'th term of -5, -31, -57, -83, -109, -135?
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What is the r'th term of -1047, -1044, -1039, -1032, -1023?
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What is the b'th term of -28, -101, -222, -391, -608?
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What is the g'th term of 6, 36, 64, 90?
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What is the m'th term of -1411, -1410, -1409?
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