Help I tried finding answers nothing showed so now I’m here asking y’all :)

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?

9/10 divide by -3/15 as a mixed number

Aright cylinder has a diameter of 8 m and a height of 6m. what is the volume of the cylinder