In making a topographical map, it is not practical to measure directly heights of structures such as mountains. This exercise illustrates how some such measurements are taken. A surveyor whose eye is a = 6 feet above the ground views a mountain peak that is c = 2 horizontal miles distant. (See the figure below.) Directly in his line of sight is the top of a surveying pole that is 10 horizontal feet distant and b = 7 feet high. How tall is the mountain peak? Note: One mile is 5280 feet