PLS ITS MY LAST QUESTION AND I HAVE LIMITED TIME

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?

:24% of students in a class are girls. if there are less than 30 students in this class, how many students are there? how many girls are there?

Show all work to identify the discontinuity and zero of the function f of x equals 6 x over quantity x squared minus 36