Why is 6/8 greater than 5/8 but less than 7/8

Find the number of positive three-digit even integers whose digits are among 9, 8, 7,5, 3, and 1.

Need on this geometry question. explain how you did it.

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?