the volume of a sphere is a function of its radius. find the volume of air in a standard volleyball with a diameter of 8.5 inches, given v=4/3πr^3

An airplane is flying at an elevation of 5150 ft, directly above a straight highway. two motorists are driving cars on the highway on opposite sides of the plane, and the angle of depression to one car is 35 ̊ and to the other is 52 ̊. how far apart are the cars?