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

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asked Feb 11, 2018 230k views

1 Answer

Danield · Answer 1 · 2018-02-15T18:23:21+0000

Common ratio means that you will be multiplying from the first number to get the second number.
To find the ratio we will work backwards, from right to left, and divide instead of multiply.
-43/-21.5 = 1/2
-86/-43= 1/2
-182/-86 = 1/2
r = 1/2

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

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