To represent the scenario you described graphically, we'll break it down into three distinct phases:
-
Filling Phase (0 to 5 minutes):
- During the first 5 minutes, the water is filling up the tub at a constant rate. This would show a linear increase in volume on the graph.
-
Paused Phase (5 to 20 minutes):
- After 5 minutes, Barbara turns off the water for 15 minutes. During this time, the volume of water remains constant. On the graph, this would be represented as a horizontal line for 15 minutes (from 5 to 20 minutes).
-
Draining Phase (20 to 40 minutes):
- After 20 minutes, the water begins to drain at a constant rate for 20 minutes. This will be represented as a linear decrease in volume on the graph. The graph would slope downward during this period.
Putting this all together, the graph would:
- Start at a point (let's say it begins at 0 volume at 0 minutes).
- Show a linear rise from 0 to some peak volume over the first 5 minutes.
- Show a flat horizontal line at that peak volume from 5 to 20 minutes.
- Show a linear decline from the peak volume back to 0 over the final 20 minutes.
In summary, the graph would have:
- An initial linear increase,
- A flat section,
- Followed by a linear decrease.
If you have specific graphs to choose from, look for one that matches this description.