Answer:
,
Step-by-step explanation:
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Not me
Step-by-step explanation:
 
        
                    
             
        
        
        
This is a one-step equation. All you need to do is multiply the 2.5 over to the 20 to get x by itself.
x=50
Hope this helps!
        
                    
             
        
        
        
Answer:
(2,√21)
Step-by-step explanation:
The circle centered at the origin has equation:

Any point that satisfies this equation lie on this circle.
When x=2, we substitute and solve for y.

Take square root to get:

Therefore (2,-√21) and (2,√21) are on this circle.
From the options, (2,√21) is the correct answer
 
        
                    
             
        
        
        
The answer to this question is:
305808068601324999999995 and 3.05808068 * 10^23