Area = length times width (l x w)
Length = 9 feet
Width = 40 inches
Convert the length of 9 feet to inches
9 x 12 = 108
Length = 108 inches
Width = 40 inches
Multiply them together to find the area.
108 x 40 = 4,320
Now convert them back to feet to because that is what the question is asking you to do.
4,320/12 = 360ft^2
The answer is a, 360ft^2