2⋅−21 PLZ I NEED HELP

Evaluate cos2θ for cosθ = square root of 3/2

The human resources manager at a company records the length, in hours, of one shift at work, x. he creates the probability distribution below. what is the probability that a worker chosen at random works at least 8 hours? 0.62 0.78 0.84 0.96

If the square of a positive integer is added to 2 times the integer the result is 48. find the integer.