You know
Squaring both sides gives
Then raising both sides to any integer power 
gives
That is, any power of 
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
