Which is the simplified rational expression for 9x-5/4x-1 + (3x+8/4x-1 - 5x+3/4x-1)

Which statements regarding the diagram are true? check all that apply.

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?

Whats are the trickiest steps to do when adding or subtracting rational expressions? how does knowledge of rational numbers u in adding and subtracting rational expressions?