What is the greatest common factor between 88 and 99

If a is the greatest common factor of 72 and 48, and if b is the greatest common factor of 108 and 1...

What is the greatest common factor of 45 and 54 1 9 3 45

what is the greatest common factor of the terms of the polynomial below 20x^4-10x^3+15x^2 response...