ANSWER

The pattern is geometric.
Step-by-step explanation
The given pattern is:
7, -21, 63, -189,..
We can see from the pattern that,

Since there is a common ratio of -3, the pattern is geometric.
The first term of this pattern is

The nth term of the pattern is given by the formula:

To find the 23rd term, we put, n=23, the first term and the constant ratio.


