3,9,6,9,27,24,27,81,78,81,243,? find out last figure to complete series

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.

The measure of angle 0 is 600 degrees

Find the unit rate for: 75% high-fiber chimp food to 25% high -protein chimp food.