Which is the missing term? i need the answer like right now and whoever gets it first gets a brain list plz it’s 40 points

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.

How many sides does a regular polygon have if each exterior angle measure is 45 degrees explain your answer, i really don't understand this.

8litres of paint can cover 129.6 m². how much paint is required to paint an area of 243m²?