are the following polynomials in a column a match the correct answer in column b then why the letter of the correct answer on the blank before each number

1. (9ײ) + (-4ײ) + (7ײ)
2. (2ײy + 8×y) +(-9×y
3.(8×+3y-6×y)+(-5×+2y+3×y)
4.(-23a²+18ab)+(12a2-8ab
need ko po yung answer ​