CAN SOMEONE PLS HELP ME OUT ON THIS PROBLEM?!?! PLSSS

F(x)=x/2-2 and g(x)=2x^2+x-3 find (f+g)(x)

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.

Find the nonpermissible replacement for binthis expression.b2/5b +5