Write a formula for the nth term of the indicated sequence. Write out the first five terms of the sequence.geometric: a3 = 80, r = -4
A. an = 5 ? (-4)n; -20, 80, -320, 1280, -5120
B. an = 5 ? (-4)n; 5, -20, 80, -320, 1280
C. an = 5 ? (-4)n+1; -20, -80, -320, -1280, -5120
D. an = 5 ? (-4)n-1; 5, -20, 80, -320, 1280
Answer: D
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