Question 1039162
None of those functions have inverses that are functions -- for the inverse to be a function, the inverse relation must satisfy the property that each input maps to at most one output.


For example, the first function's inverse is not a function since the inverse is {(3,-4), (7,-2), (0,-1), (3,4), (-7,11)}, and here we see that 3 maps to two values (-4 and 4).

The same holds for the other functions.