If Quadrilateral J K L M is congruent to quadrilateral C B D A, which pair of sides must be congruent?

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.

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

15m is what percent of 60m; 3m; 30m; 1.5 km? the last one is km not m