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How many miles is 7.84 km? Is 18(O) an element or iron? Why is Mjaarten's dad 1? What is the derivative of the sqrt of 2x? The book says the answer is the sqrt of 2/2•sqrt x. But I keep getting 1/sqrt(2x).? Classify the reaction as exothermic or endothermic: decomposition of potassium chlorate: 2KClO3(s)→2KCl(s)+3O2(g)+77.6kJ?