Can someone please help me

What is the length of the segment joining the points at (4,5) and (6,-2) round to the nearest tenth if necessary

What term makes it inconsistent y=2x - 4

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.