Answer:
The 21st term is 137.
Step-by-step explanation:
Arithmetic progression:
In an arithmetic progression the difference between consecutive terms is always the same, and its called common difference.
The nth term is given by:

In which
is the first term and d is the common difference.
The first two terms are -3, 4.
This means that 
So


The 21st term is

The 21st term is 137.
I think it would be 324 divided by 4 = 81 in.
Answer:
94,128
Step-by-step explanation:
The answer is <span>a number that can be written as a ratio of two integers.
I hope this helps!</span>