What is the coefficient of the x2-term

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.

In which direction does the left side of the graph of this function point? f(x) = 3x3 - x2 + 4x - 2

Eric drove 275 miles in 5 hours. at the same rate how long would it take him to drive 495 miles?