I need help figuring out the answer to 567- 300

Find the solution of this system of equation -7x+y=-20 9x-3y=36

The square pyramid has a volume of 441 cubic inches. what is the value of x? 1/7x is the height x is the base

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