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**HallsofIvy** Your question is very vague. If you are asking about the **definition** of function, then it is "a set of ordered pairs such that no two pairs have the same first member". Often, it is enough to write a "formula" such as "$\displaystyle y= x^2$" which tells us how, given the first member, to find the second member of each pair. Strictly speaking, we must also specify what numbers the "first member" (x) can be- that is, specify the "domain"- but typically that is the set of all numbers for which the formula **can** be calculated.

Since you ask about "question that ask me about the Function of (X)", if you were to post the actual questions, we might be able to help you more.