Identify the following series as arithmetic, geometric, both, or neither.

Arithmetic means they increase(or decrease!) by common number. 1,2,3,4, is an example because they increase by ones every time. 

Geometric means that it increases (or decreases!) by a common RATIO, such as 1,2,4,8 with the common ratio of 2. 

There is no way for it to be both, notice. 

Without the following series, I can't really help.

If this enlightened you, please give brainliest answer, rate, and thank!

It would take her 20 minutes.