The surface area of a cylinder is given by S=2prh + 2pr2 where r is the radius of the base and h is the height of the cylinder.
Solve the formula for h.

Twenty-five percent of the customers entering a grocery store between 5 p.m. and 7 p.m. use an express checkout. consider five randomly selected customers, and let x denote the number among the five who use the express checkout.

How do i do this? i don’t understand

Evaluate cos2θ for cosθ = square root of 3/2