The annual labour and material cost ( in millions of dollars) for a company’s productionof computers is given by C(x, y) = 2x^2+ 2xy + 3y^2-16x -18y + 54, where x is theannual labour cost and y is the annual material cost (both in millions of dollars).

Abird on top of a 200 ft bridge tower sees a man standing on the lower part of the bridge (which is 50 ft above the ground). the angle of depression from the bird is 26 ̊. how far is the man from the base of the bridge tower? with explanation and pictures .