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43.52 centimeters (cm) has four significant figures. The final figure in place four of '2' is the most uncertain. This is because the measurement device or calculation may have originally been 43.516 through 43.519 before rounding or due to instrumentation uncertainty.
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What are the issues with burning ethanol?
I'm uncertain what kind of "issues" you mean. Ethanol is a reasonably good fuel. It has the same "issues" as nearly every flammable liquid, namely that it's flammable and burning it produces carbon dioxide and water vapor, both of which are greenhouse gases. One potential issue peculiar to ethanol is that most fuels are not at risk of being diverted for beverage purposes. This can be ameliorated by denaturing the ethanol, though.
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What is the smallest six-digit even number at most two times only?
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