May someone please help me with this :) I have to find the value of x

H(x)=4x2-5x h(-3) what is the answer?

If f(x)=x^3 and g(x)=2x+7 when g(x)=-5

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?