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?
a. 4x + 89.95 = 628.35; x = $134.60
b. 4(89.95) + x = 628.35; x = $268.55
c. 4x + 89.95 = 628.35; x = $179.58
d. 4(89.95) + x = 628.35; x = $538.30