Answer:
2. Â Â Â Â 3x + 4
Step-by-step explanation:
What we know:
w=x
Perimeter (p) = 8x+8
Formula for perimeter  p =2(L+W)
8x+8 = Â 2(L+W)
L+W is half, so  Â
 L+W = 4x+4
Substract W on both sides;
L = 4x+4 -W Â Â
We know that  W = x
So
L= 4x+4-x
4x-x= 3x
L= 3x+4