I need help for this question ASAP

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.

What is the effect on the graph of the function f(x)=x when f(x) is replaced with -f(x)+4

0if x and y vary inversely and y=6 as x=7, what is the constant of variation?