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If the point $(2,9)$ is on the graph of $y=f(x)$, then there is one point which must be on the graph of $y=f(-x)$. What is the sum of that point's coordinates?

 Feb 25, 2021
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$f(2)=9\implies f(-(-2))=9$, the point is $(-2,9)$ and the sum is $9-2=\boxed{7}$.

 Feb 25, 2021

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