Answer:
The greatest common factor or GCF is the greatest common factor of 2 or more numbers or polynomials.
Step-by-step explanation:
We have to create a factor-able polynomial with a GCF of 3x.
We can take an example of : (x) = 
We can rewrite this as : 
WE can also rewrite it as : 
Use a and c because you need to know the description and relationship between a-b to get your end result
1st term: 20 dollars
2nd term:40 dollars
3rd term: 60 dollars
4th term:80 dollars
5th term:100 dollars
6th term:120 dollars
I hope this is correct.
the answer is definitly C