- Does energy of light change when it travel from rarer to denser medium..?

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400000 in word? Let X be a random variable with E(X)=3 and Var(X)=9. Then E(X^2) is? (The answer should be 18 but explain?)? Is the earth flat or round? Jw wondering what people are thinking nowadays.? Decide if the function is an exponential function. If it is, state the initial value and the base. y=8^x? If a blimp contains 536kg of helium, how many helium atoms are present inside the blimp?