I think it’s b to be honest with you
        
                    
             
        
        
        
Answer:
The GCF should be 9 
Step-by-step explanation:
 
        
                    
             
        
        
        
Answer:
The answer is: small+large.
Step-by-step explanation:
If the variable of the smaller sheetrock is stored in small:
var small.
And the variable of the larger sheetrock is stored in large:
var large.
The length of the wall will be the sum of the two pieces of sheetrock:
For example: 
var small = 5;
var large = 10;
small+large = 5 + 10 = 15 is the length of the wall.
 
        
             
        
        
        
The second one is a perfect square trinomial 
X^2+16x+64
        
             
        
        
        
For anyone else who needs the right answer...it’s “parallel to the base”. I just did it and I got it right.