How do I set the page margins?

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Latex has a package called geometry which deals with page margins. Add

\usepackage[margin=<x>in]{geometry}

where <x> is the desired margins

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How do I set proper labels for my numbered lists?

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Latex ...

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How do I skip numbers in numbered lists?

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Latex ...

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How do I have cells in tables take up multiple rows/columns?

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Latex ...

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