Question

Simplify the expression 6ab + 3ab - 7ab. What is the coefficient of the simplified expression?

Answer 1

Simplifying 6ab + 3ab - 7ab
so we can write it 
6ab + 3ab - 7ab = 0 ( because there is nothing on right side ) 
9ab - 7ab = 0
2ab = 0
So the coefficient of ab is 2.

Correct option is C.

Answer 2

To simply to expression 6ab+3ab-7ab, we do:
6ab+3ab-7ab+= (Just do regular addition and subtraction if they have the same coefficent)
9ab-7ab=
2ab
So the answer is C.