what is the simplified form of each expression?
question 1: 3x+7x+2x A. 12x B. 10+2x C. 12+5x D. 10x
question 2: 2(8x) A.16x B.2(8)+2(x) C.10+x D.10x
question 3: 4(3x+2y) A.20x B.12x+8y C.20xy D.12x+2y​