Help!! Thank you so much

Does the point (1, sqrt 7) lie on circle shown.

Diane’s bank is offering 5% interest, compounded monthly. if diane invests $10,500 and wants $20,000 when she withdrawals, how long should she keep her money in for? round to the nearest tenth of a year.

Solve this problem! extra ! 3025/5.5 = a/90.75