Please help this is due tomorrow and im having a lot of trouble figuring these out

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?

Joe has some money in his bank account he deposits 45$ write an expression that represents the amount of money in joe's account

The cost of using a service is $0.25 per min. what equation correctly represents the total cost c, in dollars, for d days of use?