Find the sine of angle A in a right triangle, given that the opposite side is 10 and the hypotenuse is 15.
+
What is the surface area of a rectangular prism with dimensions 8 cm, 5 cm and 3 cm?
+
What is the average (mean) number of books read per month by a group of 20 students given the following data: 12, 14, 9, 10, 15, 11, 8, 13, 17, 16, 7, 12, 9, 11, 15, 13, 9, 12, 14, 10?