I am just trying to get mo points but i can´t fing where to go

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?

Ill mark the brainliest if you me with the these three questions 7,8,9

Extra points! find the missing dimension! need asap