Algebra

If f(a)=K, then which of the following must be true?

!@#$%^&)=a
f inverse(k)=a
f inverse(a)=K

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asked by Jon
  1. Properties of inverses:
    If f(a)=K
    then
    1. f-1(K)=a
    2. f-1(f(a))=a
    ... etc

    None of the above answers is correct unless the second one says
    f inverse(K)=a (i.e. uppercase K)

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  2. If ƒ(x ) = 2x, then ƒ -1(x ) =

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