What’s the value of x ?

What is the solution of sqrt x+2-15=-3

When the solutions to each of the two equations below are graphed in the xy-coordinate plane, the graphs of the solutions intersect at two places. write the y-cordninates of the points of intersection in the boxes below in order from smallest to largest. y=2x y=x^2-3

Evaluate cos2θ for cosθ = square root of 3/2