The cost for the raw materials of marble countertops, can be represented by the function , where is the area of the countertops.
The retail markup, can be represented by the function. Which function can be used to find the marked-up price of a marble countertop depending on the area?
The set A U B is represented by shading both circles A and B (also the overlapping region as well). Any point in set A U B will be in either A, B or both.