Peaches are on sale for 0.95 cents per pounds if i have 2.75 pounds how much did i pay for the peaches? (Please help im horrible at this)

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.