Answer:
Im not 200% sure but i think its 11
If width is w the length can be represented as 5/2+2w.
Formula for perimeter is 2l + 2w
So it would be 2w + 2(5/2 + 2w)
OR 2w + 5 + 4w
OR 6w + 5
See if this helps ;)
b or d
Step-by-step explanation:
w = 18
w-3=15
Add 3 to each side
w-3+3=15+3