In how many ways can 2 students be selected from a group of 5 students in a debating competition?

What is the rate of change of the volume V of a hemisphere with respect to its radius r when r = 2?

determine the maximum value of y=3x\(^2\) + 5x - 3

A trapezium has two parallel sides of lengths 5cm and 9cm. If the area is 91cm\(^2\), find the distance between the parallel sides

find the value of p if the line which passes through (-1, -p) and (-2,2) is parallel to the line 2y+8x-17=0?