Question 101786
There is an answer. 

Consecutive odd integers. So if W=3 then L=5, if W=13, then L=15. So the relationship is Width = W, Length = W+2, where W is an odd integer. 

Now the perimeter, P, of a rectangle is twice the width plus twice the length or 
P = 2(Width)+2(Length)
Let's substitute with values from above: 

P = 2(Width)+2(Length) Substitute for Width and Length in terms of W
P = 2(W)+2(W+2)
P = 2W+2(W)+2(2) Use the distributive property and simplify. 
P = 4W+4