Choose and use two mathematical properties (the commutative property, combining like terms, or the distributive property) to create one equivalent

Airline passengers arrive randomly and independently at the passenger-screening facility at a major international airport. the mean arrival rate is 10 passengers per minutes. compute the following probabilities. p(x = 4) p(x > 11)

Fredrick designed an experiment in which he spun a spinner 20 times and recorded the results of each spin

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.