Story problem: mount saint helens, a volcano, erupted on may 18, 1980. before the eruption, mount st. helens was 2,950 meters high. after the eruption, it was 2,550 meters high.

before the eruption, how many kilometers high was mount st. helens?

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.