Does the point (2, sqrt 6) lie on the circle shown? hurry !

If you could answer these your a life saver

Alcoa was $10.02 a share yesterday. today it is at $9.75 a share. if you own 50 shares, did ou have capital gain or loss ? how much of a gain or loss did you have ? express the capital gain/loss as a percent of the original price

Can someone me with this graph problem by the way i need to know the answers by today since this assignment is due ! !