What value of n makes the equation ? 4(0.5-3)=n-0.25(12-8n)

Me find the measure to side a and the process to solve the problem you appreciate it : )

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.

Evaluate the discriminant of each equation. tell how many solutions each equation has and whether the solutions are real or imaginary. x^2 - 4x - 5 = 0