N/12=300 how do i figure out what the value of n is?

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.

Question 5 spring semester final exam math evaluate

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