My example is for the supply and demand of children cars, to start the use of material and equipment is $200. The cars will sell for $5 so my equations are y=5x+200, and y=-3x+400

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.