Six less then the product of four and number x

Find the length of cu, the triangles are similar.

David must install fencing around a lot that is shaped like a right angle.the side of lot that runs east-west is 200 ft long.the side of the lot runs north-south is 125 ft long.calculate how many feet of fencing he will need to surround the entire lot.

Find the values of y: 3y^3(y^2+ 2/3y)=0