Evaluate the expression, xz- y, if x=3,y=6, and z =7

What is the approximate total length of iron edging needed to create the square frame and the two diagonals?

Write numerical coefficient of y² in the expression 2x² - 15xy – 7y²

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?