Pelease help me thank you for your time

This is so hard and it’s for a test

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?

Which letters from the table represent like terms? a and b b and c a and d b and d