Please help! I will mark as brainliest IF answer is right. <3

Answer:
1.W=3+2L
The width is 9ft
2.part 1) W=100-L
part 2)A (L)=L (100-L)
3.=3×width=3×(3ft)=9ft
9feet.
Step-by-step explanation:
i hope its help