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
I kept getting 900 i am sorry if that is incorrect
Answer:
N=10
Step-by-step explanation:
Answer: 2.26
Step-by-step explanation://Give thanks(and or Brainliest) if helpful (≧▽≦)//