The first question, wants us to know the area of the window. The window is a rectangle, and the area of a rectangle is given by the product of its sides. The sides of the window are 2ft and 18in. To multiply those values, we need to put them in the same units.
We know that
We can rewrite the side in inches as:
Now, to find the area of the window we just multiply its sides.
The area of the window is 3ft².
The following question asks the value of the shaded area. The shaded area is given by the area of the whole wall minus the area of the window. The area of the window was solved before. To calculate the area of the whole wall, since it is a rectangle we also just multiply its side. Since it is already in the same units, we just multiply its sides.
Now, to find the value of the shaded area we just subtract the area of the window
The shaded area is 45ft².