Question

Which sequences are geometric? Check all that apply.
10, 7.5, 5.625, 4.21875, …
160, 40, 10, 2.5, …
20, 70, 245, 857.5, …
13, 16.5, 20, 23.5, …
5, 5.5, 6.05, 6.655, …
16, 17.1, 18.2, 19.3, …

Answer 1

You can tell a sequence is geometric if it has a COMMON RATIO.

Basically divide each number by the previous number, and see if the quotient is the same throughout.

Answer 2

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