Question

Which sequences are geometric? Check all that apply.

Answer 1

The correct answers are:

–1, 2.5, –6.25, 15.625, ... ; and 8, 0.8, 0.08, 0.008, ...

Explanation:

A geometric sequence is one in which every term is found by multiplying the previous term by a constant.

In the sequence -1, 2.5, -6.25, 15.625, ..., each term is found by multiplying the previous term by -2.5.

In the sequence 8, 0.8, 0.08, 0.008, ..., each term is found by multiplying the previous term by 0.1.

Answer 2

–1, 2.5, –6.25, 15.625, ...

r=-2.5

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8, 0.8, 0.08, 0.008, ...
r=0.1

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