If n=3a-6 which inequality below will make n a positive number

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.

Rewrite the following quadratic functions in intercept or factored form. show your work. y = 9 + 12x + 4x^2

Rewrite the following quadratic functions in intercept or factored form. show your work. f(x) = 3x^2 - 12