I know this is a long word problem but could anyone answer one of these questions

Find the given elements if matrix d:

What is the area of mnp? 40 m2 60 m2 68 m2 127.5 m2

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.