What should max charge for a package of paper plates in his store if he bought them for $9.00 and wants to make a 75% profit

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.

Given the following linear function sketch the graph of the function and find the domain and range. ƒ(x) = -5x + 4

What is the slope of the line passing through the points (3, 3) and (5, 7) ? 1. 2 2. 1/2 3. −2 4. −1/2