Help me pretty please:/

Find an equation of the line perpendicular to the graph.

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?

Simplify. (-2)^-3 a. -8 b. -1/8 c. 1/8 d. 8