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math

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which of the following functions have a inverse?

f(x)=ab.solute value of x.
f(x)=x^3
f(x)=x^4
f(x)=x^3
f(x)=x^4,xless then or equal 0.

how do i know if they have an inverser, can someone please explain:) thanks for your time YOOO

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