Got 4/5 marks and confused on how to get the final mark

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 expression is not a polynomial?

Choose the more precise measurement. 26.4 cm or 8.39 cm