The interval in which water is decreasing is 4 < x < 6.
What does this graph show?
This graph shows the way water levels change over time. In the graph, the horizontal axis or x represents time.
In which interval do the values for y decrease?
There are two main intervals in which the values for y decrease over time, the first one is 4 < x < 6, and the second one is 11< x < 16.
Based on this, one of the correct intervals is 4 < x < 6 because in this section value decreases from 1.5 to 1.
Learn more about intervals in: https://brainly.com/question/2427300