Can someone me identify the bases and the height of this trapezoid on problem 1? you!

1. (The base on top is 15 ft.  
To find the base on the bottom you have to first find the length of the right side of the triangle. 7 - 4 = 3. Then, square both sides of the triangle and add them together. 15^2 + 3^2 = 234  
Next take 234 and find its square root = 15.3. The bases of the trapezoid are 15 and 15.3)  
2. (Both bases and the height.)  
3. (2l + 2w does not belong, all of the equations are formulas for area but that one is perimeter)

No he does not because he can only cover 12 square feet from 15 square feet which he will still need 3 more. this is because if 3×5=15 square feet and 15-12=3 which thats the answer

Could you make it more clear?