I need help with this question, it is a question from a stats unit

In trapezoid klmn, kj=19.2 and jm=22.5. identify ln.

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.

Gh bisects fgi. find the measure of hgi •15° •21° •10° •8°