The 10th term the arithmetic sequence if a1=-15 and d = 6

Determine whether the angles in each given pair are coterminal. 744°, -336°

Which of the binomials below is a factor of this trinominal? x^2-13+30

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.