Answer:
The expressions represents the perimeter of the rectangle is 
 .
 .
Explanation:
Let the width of the rectangle be x
We are given that The length of a rectangle is one unit shorter than one-sixth of the width x
Length of the rectangle = 

Perimeter of rectangle = 

 = 

 = 

 = 

Hence The expressions represents the perimeter of the rectangle is 
 .
 .