In what place is the digit 1 in the number 607.91?

How do i do this? i don’t understand

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?

Atriangle with all sides of equal length is a/an triangle. a. right b. scalene c. equilateral d. isosceles