What was the radius of the first ferries wheel

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.

What’s the range cuz i can’t find it?

What is the area of the original rectangle? 8 cm² 20 cm² 25 cm² 40 cm²