Solve for x, sqrt of x-4 + sqrt of x+4 =4

Which of the expressions (on the photo document i inserted) together represent all solutions to the following equation? 8cos(12x)+4=-4 *the answer should be in degrees.* > i would like for someone to explain the process to find the solutions for this.

Which expression converts 45 degree to radians

What are the coordinates of the point that is 1/3 of the way from a to b? a (2,-3) b (2,6)