Answer:
5 i think
Step-by-step explanation:
to start you need to find the total area the side of the roof he plans to cover which is 360 feet.
16x2 + 20x2 = 72
so lets just say thats the total area of one solar panel then you could just divide 360 feet by 72 feet to get...
5. so i guess william needs 5 solar panels
i could be spouting nonsense rn.. so sorry if im wrong