Find the area of a triangle whose base is x^2+2x+4 and whose height is 2x^2x +2x+6

If 10 men take 18 days to mow 60 acres of grass, how long will 15 men take to mow 80 acres?

Ineed in figuring out this problem.

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