Diameter
10 in.
Circumference
31.42 in.
Ratio
C
— =
d

Can someone me with this problem i don't understand i need

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?

Can some one me with these questions