Answer:
Step-by-step explanation:
The odd numbers.
Suppose you have 31 and 27 when you add these two together, you get 58 which is not an odd number. 
If you need a more mathematical proof, you could do it this way.
2x+1 
2x is even. Anything multiplied by 2 is even. When you add 1 you get an odd number
So continue on
2y + 1 is the other number.
2x + 1 + 2y + 1 = 2(x + y) + 2
2 (x + y ) is even. When you add 2 to it, nothing changes. The result is still even.
 
        
             
        
        
        
9514 1404 393
Answer:
   y = 0
Step-by-step explanation:
Subtracting the right side gives ...
   
The factor multiplying y cannot be zero, so y must be zero.
 
        
             
        
        
        
Answer:
30 m
Step-by-step explanation:
You simply add the lengths of all the sides. 3 m is not needed for this. 
 
        
                    
             
        
        
        
Answer:
222222222/1000000000
Step-by-step explanation:
 
        
                    
             
        
        
        
Answer: 8(u - 10)
Step-by-step explanation: