Need an answer within an hour i will give brainlist dont write just anything please. thank you

Given that ot =5, xt=12, and ox= 13 is xy tangent to circle o at t? explain.

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

What will the graph look like for a system of equations that has no solution? a. the lines will be perpendicular. b. the lines will cross at one point. c. both equations will form the same line. d. the lines will be parallel.