Question 1: Like terms have the same variable, so it is 7b and b. Question 2: Should be 6y and -9y.. Question 3: the answer is 1. It's 2n because it has the same variable. Question 4:3a2b Question 5: 2 Question 6:4x Question 7:11v Question 8:-8n Question 9:-2x Question 10:-2x this is the same as question 9? Question 11:2r-14 Question 12:7m-7
