Sadie had 85 cookies. she ate 80. how many are left

Evaluate the following expression 1/3^2

If 1/√5+1/√5+1=p+q√r , find the values of p, q and r

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?