The rate for internet access is 15 dollars per month plus 10 dollars per hour use. which function rule represents the monthly bill for x hours of use

Asap 25 pts + brainlest to right/best answer

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?

Math it's appreciated. (picture provided)