Write a formula for the nth term of the indicated sequence. Write out the first five terms of the sequence.geometric: a3 = 75, r = -5

A. an = 3 ? (-5)n; 3, -15, 75, -375, 1875
B. an = 3 ? (-5)n+1; -15, -75, -375, -1875, -9375
C. an = 3 ? (-5)n; -15, 75, -375, 1875, -9375
D. an = 3 ? (-5)n-1; 3, -15, 75, -375, 1875


Answer: D

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