Looking over a wall: Twenty horizontal feet north of a 50-foot building is a 35-foot wall (see Figure 3.37). A man 6 feet tall wishes to view the top of the building from the north side of the wall....

Looking over a wall: Twenty horizontal feet north of a 50-foot building is a 35-foot wall (see Figure 3.37). A man 6 feet tall wishes to view the top of the building from the north side of the wall. How far north of the wall must he stand in order to view the top of the building?