A small tile balcony is shown . Each tile is 9 square inches .what is the area of the shaded section in square inches

The answer to this is D. 180 square inches.
The area formula for rectangles: b*h
The base is 5 tiles.
The height is 4 tiles.
4*5=20.
Since each tile is 9 square inches, 20*9=180.
Hope this helps!