Which of the following number sentences is an example of the associative property? Select all that apply. A. (1 2/5 x 3 1/2) x 4 = 1 2/5 x (3 1/2 x 4)

B. 6.3 x 1 = 6.3

C. 10 x (4.6 x 3) = (10 x 4.6) x 3

D. 2.5 x (1.8 + 6.3) = (2.5 x 1.8) + (2.5 x 6.3)

The first few steps in solving the quadratic equation 9x2 + 49x = 22 ? 5x by completing the square are shown. 9x2 + 49x = 22 ? 5x 9x2 + 54x = 22 9(x2 + 6x) = 22 which is the best step to do next to solve the equation by completing the square? 9(x2 + 6x + 3) = 25 9(x2 + 6x + 3) = 49 9(x2 + 6x + 9) = 31 9(x2 + 6x + 9) = 103