Actually, I think they're fairly easy to digest. So one is that if I have some third random variable, let's say I have some third random variable that is defined as being the random variable X plus the random variable Y. Let me stay with my colors just so everything becomes clear. The random variable X plus the random variable Y. What is the expected value of Z going to be? The expected value of Z is going to be equal to the expected value of X plus Y. And this is a property of expected values.