X1 = 10, X2 = 4, X3 = 9, X4 = 7 What is the value of EX?

In which figure is de bc ? a. figure 1 b. figure 2 c. figure 3 d. figure 4

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?

Can someone show me step by step how to do this?