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Suppose that $g(x)=f^{-1}(x)$. If $g(-15)=0$, $g(0)=3$, $g(3)=9$ and $g(9)=20$, what is $f(f(9))$?

 Jul 14, 2018
 #1
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From \(g(3) = 9\), we know that \(f(9) = 3\).

From \(g(0) = 3\), we know that \(f(3) = 0\).

f(f(9)) = f(3) = 0.

Other informations are useless ones.

 Jul 15, 2018

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