Solve -15 = -5*f, -2*c + 10*f = 5*f + 9 for c.
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What is the a'th term of 10, 53, 124, 223, 350?
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What is the h'th term of 5, 45, 111, 203?
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What is the n'th term of 21, 85, 193, 345, 541?
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What is the b'th term of 411, 813, 1215, 1617, 2019, 2421?
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What is the n'th term of -15, -21, -31, -45, -63?
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What is the f'th term of 688, 690, 692, 694, 696?
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