15 students have roles and 25 do not I hope this is right or at least helps :)
Eheehhdudhrjfhfhfufufhfufhrudjdjsifurjejdhf
It is an irrational number. A number is rational if it can be expressed as a quotient of 2 integer numbers. Number π2 cannot be expressed as a quotient of integers, so it is an irrational number.
Conic sections are defined using a directrix (<span>a fixed line used in describing a curve or surface) and a focus, and those are: parabola, ellipse, and hyperbola. </span>