it has to be a serif font, and size 12. help?
Bookman old style. It's bigger than times new roman, century schoolbook, Garamond and other serif font. If you want your essay to be longer, use Courier New. It's mono-spaced font and it make letters to occupy the same amount of space.
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Try these fonts. I'm not sure if they are much larger, but you might want to try. OCR A Extended MS Reference Sans Serif Lucida Sans Typewriter Galant Wide Fusi Extended Clean