Answer:
12 divided by 12 is 1
Step-by-step explanation:
A calculator helped me
 
        
                    
             
        
        
        
Answer:
the formula for finding the perimeter of a rectangle is P=2L+2W
an example of how to find the perimeter is 
Explanation:
For a rectangle, its perimeter is the sum of all for sides. 
The rectangle has a perimeter of 54. Find the lengths of the unknown side. That is, find S.
54=20+20+S+S
Simplify
54=40+2S
Solve for S
14=2S
S=7
Step-by-step explanation:
 
        
             
        
        
        
Answer:
9 over 5
Step-by-step explanation:
 
        
                    
             
        
        
        
Answer:
x+3
Step-by-step explanation:
21=7x3. Hence answer is 3
 
        
             
        
        
        
Answer:
12
Step-by-step explanation:
List out factors of 60 =
1 x 60 = 60
2 x 30 = 60
3 x 20 = 60
4 x 15 = 60
5 x 12 = 60
6 x 10 = 60
1, 2, 3, 4, 5, 6, 10, 12, 15, 20, 30 and 60 are factors of 60.
List out multiples of 6 from 10 to 20.
12 and 18.
Since 12 is seen on one of the factors of 60 and a multiple of 6 between 10 and 20, the answer is 12.