What is the distance between points (-4, 5) and (8, 40) on the coordinate plane? SOME PLEASE HELP

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.

If f(x) = 6x – 4, what is f(x) when x = 8? a2 b16 c44 d52

Find the solution on the interval [0, 2pi)