Abag contains 5 red marbles, 3 blue marbles, 7 yellow marbles, and 2 green marbles. what ratio can be used to compare the red marbles to the blue marbles?

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.