Twelve sections of 3" pipe that is 57.8" long are used to construct a framework. How many standard 21' lengths of pipe must be used to cut the sections?

Paul bakes raisin bars in a pan shaped like a rectangular prism. the volume of the pan is 252 cubic inches. the length of the pan is 12 inches, and its width is 10 1/2 inches. what is the height of the pan? enter your answer in the box. will give brialist and pointsss !