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How can I find a board Certified doctor in abdominal etching in Turkey 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?)? What is the role of hydroxyapatite and collagen in bone structure? Can acceleration and displacement reach maximal values during SHM simultaneously? Explain why.? Why is it when the dichromate ion reacts with potassium sulfite in an acidic solution it becomes Cr3+?