How to round 64781 in thousands

100 points, hi, i’m not sure how to get the equation from the graph and table.

When you answer this can you explain

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?