Atown had about 2120 acres of pine trees forty years ago only about 13% of the pine trees remain how many acres of pine trees remain

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 .

The sum of the speeds of two trains is 720.2 mph. if the speed of the first train is 7.8 mph faster than the second train, find the speeds of each.

I’m really confused and need your assist me with this question i’ve never been taught