The required interval of the graph in which function is increasing (-∞, -2.5) and (1, ∞).
A function can be classified as increasing or decreasing. Thus, a function is increasing when the y-values increase, on the other hand, a function is decreasing when the y-values decrease.
The graph is a demonstration of curves which gives the relationship between x and y axis.
As per observation of the graph the curve is increasing from (-∞, -2.5) of abscissa and than decreasing from (-2.5, 1) and than again increasing from (1, ∞).
Thus, the required interval of the graph in which function is increasing (-∞, -2.5) and (1, ∞).
Complete question:
Use the graph of the function to estimate the intervals on which the function is increasing or decreasing. (Enter your answers using interval notation.)