What is the perimeter of the octagon below?

Iwant to know what 3g+5h+4g-2h is my teacher is too selfish to tell us

What is the solution set of the quadratic inequality x^2-5< or equal to 0

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.