1. which number sentence shows the commutative property of addition? 9 + 3 = 12 9 + 3 = 3 + 9 3 + (9 + 1) = (3 + 9) + 1 3 * 9 = 27 2. use the commutative property of multiplication to identify which expression is equivalent to 6(2)(x). 12x 6(2x) 2(6)(x) 6 + 2 + x 3. use the commutative property to identify which expression is equal to (6+4)*5 5 * (6 + 4) 5 * 6 + 4 * 6 5 + (6 * 4) (6 + 4 * 5) 4. what is missing for the following quantity to be true? 9x + 3y +5a =3y + _ + 5a a. 10x b. 3y c. 9x d. 5a 5. which number sentence shows the associative property of addition? choose all that apply. a. 8 + (2 + 3) = (8 + 2) + 3 b. 3x(5 + 2) = 3x(5) + 3x(2) c. 8z + 9p = 9p + 8z d. (6 + 5) + 9 = 6 + (5 + 9)