Which could not be a set of intervals for a frequency table or a histogram? 0-4,5-9, 10-14, 15-19, 20-24

O 1-5, 6-10, 11-15, 16-20, 21-25

O 1-10, 11-20, 21-30, 31-40, 41-50

O 0-5,5-9, 10-15, 15-20, 20-25

The graph represents the gallons of water in a water tank with respect to the number of hours since it was completely filled

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

Which expressions equal 9 when x=4 and y=1/3 a. x2+6y b. 2x + 3y c. y2-21x d. 5 (x/2) -3y e. 3x-9y