Convert 7.7 km into miles if 16=1 mile ? show your work

Before simplifying, how many terms are there in the expression 2x - 5y + 3 + x?

Can any one me with the answers to these questions asap?

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?