Please please help me

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.

Determine domain and range, largest open interval, and intervals which function is continuous.

Whit h equation best represents this situation the number 98 increased by an unknown number equal to 120