Write equations as sentence. x-14=9

Can some one me, i’ve been asking for so long

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?

How to find the exponential function y=ca^x, with points (1,2) and (2,1)