Question

-3.6,-5.4,-8.1,-12.15 arithmetic or geometric or neither.

Answer 1

Geometric Sequence

Explanation:

1. Check the difference.

The difference between the 1st and 2nd term

`( - 5.4) - ( - 3.6) = - 1.8`

The difference between the 2nd and 3rd term

`( - 8.1) - ( - 5.4) = - 2.7`

The difference is not the same. Therefore, it is not an arithmetic sequence.

2. Check the ratio

The ratio between the 1st and 2nd term

`( - 5.4) / ( - 3.6) = 1.5`

The ratio between the 2nd and 3rd term

`( - 8.1) / ( - 5.4) = 1.5`

The ratio is the same. Therefore, it is a geometric sequence.