The decreasing interval of the parabola represented by the graph is (-∝, 3)
How to determine the decreasing interval of the parabola
from the question, we have the following parameters that can be used in our computation:
The parabola represented by the graph
From the graph, we have the following
Increasing interval = (3, ∝)
This is because the y values increase as x increase
Decreasing interval = (-∝, 3)
This is because the y values decrease as x increase
Hence, the decreasing interval is (-∝, 3)