If f(-5) = -24, what is the value of t

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.

Asap! i'm not good math and i'm lost.

Using inductive reasoning, what are the next two number in this set? 2,3/2,4/3,5/4,