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A graph is called increasing if its $x$ -values increase.

The maximum function value is the $y$ -coordinate of the highest point on the graph.

If we say that $f$ is increasing on the interval $(2,7)\text{,}$ we mean that the function values increased from 2 to 7.

It is not possible for a function of $x$ to take on the same value at two different $x$ -values.