You know

Squaring both sides gives

Then raising both sides to any integer power  gives
 gives

That is, any power of  where the power is a multiple of 4 will always be equal to 1.
 where the power is a multiple of 4 will always be equal to 1.
So

But perhaps you mean to write 20+1 as the exponent, in which case

 
        
             
        
        
        
The answer is A. Always.
The diameter of a circle is a line that goes from one side to the other hence passing through the center!
Hope this helped!
        
             
        
        
        
I'm guessing just to show that you did your work to get the answer.
        
                    
             
        
        
        
Answer:
108+621= 100+629 hhh grade 2?
 
        
             
        
        
        
No it is not a function the are two inputs for one output