Solve pls i need help ASAP

Janet drove 300 miles in 4.5 hours. write an equation to find the rate at which she was traveling

Iam a rectangle. my perimeter is 60 feet. how much are do i cover?

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.