1. Y varies directly as x and inversely as the square of z, and when x = 32, y = 6 and z = 4. Find x when y = 10 and z = 3.
2. the volume of a cone varies jointly as its height and the square of its radius. A cone with a radius of 6 inches and a height of 10 inches has a volume of 120pi cubic inches. Find the volume of a cone having a radius 15 inches and a height of 7 inches.