#### Answer

We can represent the sum of the areas of the rectangles and squares by 20$x^{2}$.

#### Work Step by Step

The area of the first square is equal to 2x $\times$ 2x = 4$x^{2}$
The area of the second (larger) square is equal to 3x $\times$ 3x = 9$x^{2}$
The area of the smaller rectangle is equal to x $\times$ 3x = 3$x^{2}$
The area of the bigger rectangle is equal to x $\times$ 4x = 4$x^{2}$
The sum of all these area is:
4$x^{2}$ + 9$x^{2}$ + 3$x^{2}$ + 4$x^{2}$ = 20$x^{2}$
We can represent the sum of the areas of the rectangles and squares by 20$x^{2}$.