I need help with this question quick please!!

Find the greatest common factor of 28 and 35

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?

Triangle knm is what is true about the sides of knm