A team of swimmers is training for a swim meet. The table shows the number of laps each person has to swum so far and how long it took?

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.

Anyone know? is appreciated! will mark brainliest if correct!

Another type of subtraction equation is 16-b=7. explain how you would sole this equation then solve it.