3t= -8.16 what does t equal?? help me, please

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.

Simplify the following expression 48^1/2

The function f(x) is shown in this graph the function g(x)=6x