Find explicit formulas for the sequences whose initial terms are given below. That is, find a formula for the nth term of the sequence. In each case, assume that the first term's index is 0. (a) 9, 12, 15, 18, 21, ... an = (b) 1, -6, 11,-16, 21, ... (c) an = 1 2 3 4 4' 9' 16' 25' an = , n ≥ 0 help (formulas) , n ≥ 0 help (formulas) , n ≥ 0 help (formulas)

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