Posted by Jon on Wednesday, May 25, 2011 at 12:51pm.
If f(a)=K, then which of the following must be true?
f(K)=a
f inverse(k)=a
f inverse(a)=K

Algebra  MathMate, Thursday, May 26, 2011 at 9:46am
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)

Algebra  Anonymous, Wednesday, December 2, 2015 at 6:03pm
If ƒ(x ) = 2x, then ƒ 1(x ) =
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