Nsquared minus three n plus 8 if n is equal to 4

100 points, hi, i’m not sure how to get the equation from the graph and table.

If olu is twice as old as funmi if the sum of their ages is 60 how old is olu

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.