Which compound is a hydrocarbon?

CO2

C2H6

C6H12O6

H2O

By what percent will the product of two numbers change, if the first number increases by 70%, while the second number decreases by 40%.

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How should the syntax in this sentence be changed, if at all? the scientists spent years analyzing the results of numerous medical studies meant to identify the cause of the disease. no change the scientists spent years looking at the results of a variety of different medical studies meant to locate the cause of the disease. the scientists spent years reviewing medical study results to find the cause of the disease. the scientists spent years studying the results of many medical studies in order to uncover the cause of the disease.