Carbon- 14 1414 is an element which loses exactly half of its mass every 5730 57305730 years. The mass of a sample of carbon- 14 1414 can be modeled by a function, M MM, which depends on its age, t tt (in years).

Which of the following are independent events? a) knowing that it is going to rain tomorrow, and bringing an umbrella to schoolb) knowing that you have to get up early tomorrow, and going to bed before 9 p.mc) knowing that it is going to rain tomorrow, and going to bed before 9 p.md) knowing that you have a test in school tomorrow, and studying thw night before