What's the surface area for all these??

Create a data set with 8 points in it that has a mean of approximately 10 and a standard deviation of approximately 1.

Draw a scaled copy of the circle using a scale factor of 2

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.