- Please help I'm working on a quiz I opened up by mistake.?

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Gold has a density of 19.3g/cm^-3 Calculate the mass in kg of a solid cube of gold with side lengths of 10.00 cm? Decide if the function is an exponential function. If it is, state the initial value and the base. y=8^x? 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?)? Math question about find how many years a product would be halved using this formula "A(t)=a(1-r)^t? (WITHOUT USING LOGS)? 538 v in the e c?