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Which formula can be used to describe the sequence
-3, 3/5, -3/25, 3/125, -3/625

1 Answer

7 votes

Answer:

a(n) = -3(-1/5)^(n - 1)

Explanation:

From the first term, -3, we get the second term, 3/5, by multiplying -3 by -1/5.

Thus, the common ratio is -1/5.

The general formula in this case is a(n)=(first term)(common ratio)^(n - 1), or

a(n) = -3(-1/5)^(n - 1)

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