a 20 acre orchard is planted with apple and peach trees at most 10000 can be spent on planting cost planting cost for fr apple trees 400/acre and peach trees is 1000/acre choose the best graph that shows the area of each crop that can be planted

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.