Which function could the graph r represent

For the following geometric sequence, find the recursive formula. {-80, 20, -5, } i need : ')

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.

Is it greater than or less than7*3_9*2