Inverse functions are two functions that "undo" each other. Formally stated, f(x) and g(x) are inverses if f(g(x)) = x. Multiplication and division are examples of two functions that are inverses of each other.
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The inverse function means the opposite calculation. The inverse function of "add 6" would be "subtract 6".
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No. A simple example of this is y = x2; the inverse is x = y2, which is not a function.
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The opposite of another function - if you apply a function and then its inverse, you should get the original number back. For example, the inverse of squaring a positive number is taking the square root.