Write an equation for S as a function of r when the volume of the cylinder is 452 cm^3

The random variable x is defined as the number marking the sector in which the arrow lands when the spinner in the diagram is spun once.

At store a, erasers are sold individually. the cost y of x erasers is represented by the equation y=0.75x. the costs of erasers at store b are shown in the graph.

There are a total of 75 students in the robotics club and science club. the science club has 9 more students than the robotics club. how many students are in the science club?