Help me. please nobody is answering

What is f(3) for the quadratic function f(x)= 2x^2+ + x - 12

It takes a total of 6 hours to fill up an inground backyard pool using a standard house. a function can represent this situation to represent the amount of water in the pool until it is full a function of time the hose is running. determine the domain for the function

Evaluate cos2θ for cosθ = square root of 3/2