Help asap , help a girl out :’(

Given abcd ac=38 and ae=3x+4 find the value of x

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?

9/10 divide by -3/15 as a mixed number