Write in the equation for the slope intercept form and please no links or I will report you

What is the value of the expression 9+n/3-6 when n = 12? 1. 5. 7. 12.

Someone answer this check out the image!

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.