find the single discount equivalent for the series discount 20/10/20 round to the nearest tenth of a percent

What is the factored form of the following expressions? d^2 – 13d + 36

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 .

What is the area of the shaded sector?