Astoreowner wants to set up a rectangular ‘sale zone’ to display sale items on the pavement outside of his store. he will use one side of the building (which is 45 feet long) as part of one side of the display area. he will use 200 linear feet of fencing material to fence in the remainder of the display area. let x represent the length of the side of the rectangular sale zone which is opposite the building. write a function that expresses the total area a of the sale zone in terms of x .