The point is (8,9) is a solution to this system

Find the average speed of a rabbit that runs a distance of 22 m in a time of 1.8 s .

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.

Find the value of x. also give me an explanation so i can complete it to other questions as well, : )