Find the discriminant of 3x^2 - 10x = -2

I don't know what a discriminant is help

Evaluate cos2θ for cosθ = square root of 3/2

Aresearch group wants to find the opinions’ of city residents on the construction of a new downtown parking garage. what is the population of the survey downtown shoppers downtown visitors downtown workers city residents

Ineed with the quizzes in apex mathematics ii