PLz help due wednesday but i want to get it done today plz help and its a quiz so it needs to be right

Sara needs to take a taxi to get to the movies the taxi charges $4.00 for the first mile and then $2.75 for each mile after that if the total charge is $20.50 then how far was sara’s taxi ride to the movie

How do you do the foil method with polynomials?

If x varies directly as y, and x = 7.5 when y = 10, find x when y = 4