Answer: 100 ft
Explanation:
I know exactly the question you are talking about. It is #5 on the 8.4 practice. Basically you calculate the area of the parallelogram which you would do 15x4 and get 60. Then you would do the area of the trapezoid which would be 8+12=20x4=80 then divided by 2 and get 40. Then add 40 and 60 to get 100!