Can someone halp me (lol halp lol) 2×n+1

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.

What is the most accurate measurement of 1 pound

Julius sold five times as many computers as sam sold last year. in total, they sold 78 computers. how many computers did julius sell?