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Consider functions $y = f(x)$ and $y = g(x)\text{.}$

If we calculate the combination $f(4)+g(4)\text{,}$ does the result combine two $x$ -values or two $y$ -values?
Answer:

True or false: $f(3)+f(3)$ is the same as $f(6)\text{.}$
Answer:

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