Is it first , second , third or fourth

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.

Two variables, x and y, vary inversely, and x=12 when y=4. what is the value of y when x=3?

Find the solution(s) to x^2-14+49=0