Help please I didn’t pay attention in class so I don’t know

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

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?

If sin(x) = 0 and cos(x) = 1, what is tan(x)?