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    What does 'fold' mean

    When Someone says, "It increased by 10 fold", what does that mean? 10 times the original amount, or amount^10 or something like that? Thanks
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    Prime Numbers

    So I just heard about the new prime number that was discovered and for some reason got kind of interested in it. So I'm looking at prime number tables on various webpages that show the prime numbers, dates discovered, etc. I'm confused on what the "digits" column in these tables means...
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    Vector Spaces and polynomial functions

    I'm really confused about a question I came across in my textbook. It basically says this: Consider the set of polynomial functions of degree 2. Prove that this set is not closed under addition or scalar multiplication (and therefore not a vectorspace). I'm confused because I think it is...