Formula for the area of a rectangle:
A = lw (A = area l = length w = width)
To find the area of the shaded region, you first need to find the area of the smaller rectangle and the area of the larger rectangle.
Larger rectangle: A = 15(13)
Smaller rectangle: A = 11(9)
Now that you know the areas, you can subtract the area of the larger rectangle by the area of the smaller rectangle to find the area of the shaded region: [because the smaller rectangle is the unshaded region]
[Total Area - Area of Unshaded Region = Area of Shaded Region]
Larger Rectangle's Area - Smaller Rectangle's Area = Area of Shaded Region
15(13) - 11(9) = A Your answer is the 2nd option