Roseannstamina480go Roseannstamina480go Math Answered 20. Which mathematical statement is not correct? 18m - 9n = 9(2m-n) c.7a + 7b+ 14 = 7(a+b+2) b. 3ax +3ay+3az =3a(x+y+z) d. 4x+8x - 16x6 = 4x( 1 +2x - 4x²) 21. What is the missing term of (x + (x- = x - 1225?