Write a formula for the nth term of the indicated sequence. Write out the first five terms of the sequence.geometric: a = 4, r = 5
A. an = 4 ? 5n-1; 4, 20, 100, 500, 2500
B. an = 4 ? 5n+1; 20, 100, 500, 2500, 12,500
C. an = 4 ? 5n; 20, 100, 500, 2500, 12,500
D. an = 4 ? 5n; 4, 20, 100, 500, 2500
Answer: A
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