Prove this statement: For all real numbers x and y, x^2 + y^2 ≥ 2xy

Given abcd ac=38 and ae=3x+4 find the value of x

Set up and solve a proportion for the following application problem. if 55 pounds of grass seed cover 404 square feet, how many pounds are needed for 7272 square feet?

Which of the following circles have their centers in the third quadrant? check all that apply.