The function is increasing if the slope of the graph is positive and the function is decreasing if the slope of the graph is negative.
In the given graph, the slope of the graph is positive in the interval (-2.5, 0).
Hence, the function is increasing on the interval (-2.5, 0).
In the given graph, the slope of the graph is negative in the interval (-∞, -2.5) and (0, ∞).
Hence, the function is decreasing on the interval (-∞, -2.5), (0, ∞).
The domain of the function is (-∞, ∞).