Answer:
-3
Explanation:
-2(-3)=6
6(-3)=-18
etc...
To find the common ratio
Take the second term and divide by the first
6/-2 = -3
Check by taking the third term and dividing by the second
-18/6 = -3
And the fourth and dividing by the third
64/-18 = -3
The common ratio is -3
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