how do you find out if something is continuous? for example, the first question i am given on this is: f(x) = 2x+x^2/3 on [-1,1]. i know that the answer is that it is continuous but i don't understand how to get to that point.

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how do you find that...sorry, i don't understand cont. at all...

If f'(c) exist, then f is continous at c

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