Question

4ab2 - 3ab2

Answer 1

Do the same as you did on your last problem.

Answer 2

so will it be 1ab2

Answer 3

Yes, or you can just say ab2. There is always an understood 1 in front of your variables if there is no given coefficient

Answer 4

so you wouldn't add the 2

Answer 5

No. You only add degrees when you are multiplying.