Please help i have a quiz and i cant answer some questions.

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?

Express the following as a function of a single angle. cos(60) cos(-20) - sin(60) sin(-20)

In an improper fraction, is the numerator equal to, less than, or greater than the denominator