Express the terms of the following sequence by giving an explicit formula. -1/2,-1 1/2, -21/2, -3 1/2,.. A. an = 1/2 - n, where n = 1, 2, 3, 4, ...
B. an = 2n, where n = 1, 2, 3, 4, ..
C. an = 1/2 - 2n, where n = 1, 2, 3, 4, ...
D. an = 1/2n , where n = 1, 2, 3, 4, ...​

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