1. use the commutative property of multiplication to identify which expression is equivalent to 8(3)(x). a. 24x b. 8(3x) c. (3)(8)(x) d. 8 + 3 + x 2. what is missing for the following quantity to be true? 3x + 4y + 7a = 4y + 3x + __ a. 3x b. 4y c. 7a d. 7x 3. which number sentence shows the associative property of addition? choose all that apply. a. (8 · 3)(y)(3 + 7) = (8)(3 · y)(3 + 7) b. (3 + 9) + 5 = 3 + (9 + 5) c. 5z + 3p = 3p + 5z d. 12 + (3 + 9) = (12 + 3) + 9