Find the common ratio of the sequence. -172,-86,-43,-21.5

The common ratio is 1/2.

Step-by-step explanation:

Each term is half as much as the last one.  This means that to find the next term, you are multiplying the last term by 1/2.  The common ratio of a geometric sequence is the number that you multiply by to get the next term in the sequence, so it is 1/2 in this case.

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