What is the greatest common factor of 36,10,15?

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?

Opposite angles in a parrellelogram are

Find the length of the normal and the angle it makes with the positive x-axis. (see pictured below)