This can be divided into 2 rectangles. Lets find the dimension of the left rectangle.
40-30=10 so the area of the left is
[tex]10 \times 24 = 240[/tex]
Now for the one on the right
so
[tex]18\times 30 = 540[/tex]
Now lets add the areas
[tex]240 + 540 = 780[/tex]
So its 780 feet squared.