Im confused on how to work this out

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?

What is the measure of angle 1? a.28 b.152 c.168 d.64

In the diagram, ab is tangent to c, ab = 4 inches, and ad = 2 inches. find the radius of the circle.