Can you please help? The question is in the picture picture. thank you

What is the perimeter of square abcd? units units 28 units 37 units

When you answer this can you explain

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.