Is 1, 4, 9, and 16 a geometric sequence

Neither

Step-by-step explanation:

The sequence is not geometric or arithmetic because there is no common difference or common ratio between each term.

It is not a geometric sequence because you cannot multiply.

This is an arithmetic sequence because you can add.

For example:

1,4 (you use the number 3 to add to get number 4.

4,9 (you use the number 5 to add to get 9).

In other words for this arithmetic squence you use only use odd numbers.