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

 Dec 22, 2019
 #1
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f(f(9)) = 20.

 Dec 23, 2019
 #2
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Thank you.

I also wanted to thank ginger and melody for answering the other question i asked, but it's locked now.

 Dec 30, 2019

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