Over the course of a year, a tractor-trailer commutes 160,000 miles across america. assuming a trucker changes his tires every 40,000 miles, and that he starts with a brand new set of tires, how many sets of tires will he use in a year?

In the diagram, the ratio of ab to ae is (1/2) . what is the ratio of the length of to the length of ?

The volume of gas a balloon can hold varies directly as the cube of its radius. imagine a balloon with a radius of 3 inches can hold 81 cubic inches of gas. how many cubic inches of gas must be released to reduce the radius down to 2 inches?

Pyramid shown has a square base that is 18 inches on each side has a surface area of 164 square inches what is the slant height