Teheheh help please :)

The total cost of anja’s trip to the dentist was $628.35. she paid a flat fee of $89.95 which included the checkup and cleaning and then had 4 cavities filled, each of which cost the same amount. which shows the correct equation and value of x, the cost of each cavity filling?

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

Which coefficient matrix represents a system of linear equations that has a unique solution ? options in photo*