Arectangle whose length is x and whose width is 1 is called an x-block. the figure shows two of them. (a) what is the area of an x-block? (b) what is the combined area of two x-blocks? (c) show that there are two different ways to combine two x-blocks to form a rectangle whose area is 2x (d) draw two different rectangular diagrams to show that x + 2x - 3x !