Which of the following is the independent variable in an experiment?

What is the solution of the systems of equations? y=2/3x+3 x=-2

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?

If 3 3/4 lb. of candy costs 20.25 how much would 1lb. of candy cost