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, …

Geometric sequences have same common ratio between two numbers.

Either the same number is multiplied or divided between two numbers.

1) 10, 7.5, 5.625, 4.21875... The common ratio is 0.75

This is a geometric sequence.

2) 160, 40, 10, 2.5... The common ratio is 0.25

This is a geometric sequence.

3) 20, 70, 245, 857.5,... The common ration is 3.5

This is a geometric sequence.

4) 13, 16.5, 20, 23.5... This is not a geometric sequence. It is arithmetic sequence.

This is not a geometric sequence.

5) 5, 5.5, 6.05, 6.655, ... The common ratio is 1.1

This is a geometric sequence.

6) 16, 17.1, 18.2, 19.3, ...

This is not a geometric sequence.