Solve this solution the the system 7x -2y = 5 and x=y

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.

Given the function f(x) = log base 4(x+8) , find the value of f^-1(2)

Select the quadratic that has root x = 8 and x = -5