Which function is increasing at the highest rate?

Multiply. write your answer in simplest form. 3/8 x 5/7

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?

The radius of a sphere is 3 inches. which represents the volume of the sphere?