Question

help The inverse of a function is a function.
always
sometimes
never

Answer 1

Sometimes a function:
The inverse function of y=x^2 is y=+/-sqrt(x), because remember the negative square of something is the same as the positive square of it.
y=+/-sqrt(x) fails the Vertical line test.
Inverses are only one to one if the original function is a bijection

Answer 2

The answer is sometimes