Solve the inequality for 0 0

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.

Asmall book publisher knows that 26 books weigh 41 lbs. how much do 40 books weigh?

Find the measure of the missing angle