Pat needs to determine the height of a tree before cutting it down to be sure that it will not fall on a nearby fence. the angle
of elevation of the tree from one position on a flat path from the tree is upper h equals 40 degrees comma h=40°, and from a second position upper l equals 60 feet l=60 feet farther along this path it is upper b equals 30 degrees . b=30°. what is the height of the tree?