Step-by-step explanation: the small rectangle at the top of the big rectangle sides are 4ft and 5 ft because 12-7=5 and 13-9=4. This means that the area for the small triangle is 20ft. The side lengths for the big rectangle is 9ft and 12ft which means that the area is 108ft. Then you add 108ft with 20ft which gives you 128ft. Dont forget to add the squared at the end of 128ft.
