Answer:678
Step-by-step explanation:im dumb
 
        
             
        
        
        
Answer:
The unknown dimension is 35
Step-by-step explanation:
The perimeter of a rectangle is l+l+w+w or 2l+2w (l=length, w=width)



then we subtract 14 from 84



 
 
Let's check our answer

<u>Hope this helps :-)</u>
 
        
             
        
        
        
Answer:
the answer is 800in
Step-by-step explanation:
 
        
             
        
        
        
nice drawing 
(altho I think this is for other subject)