Relate graph direction and instantaneous rate
This piecewise-linear model describes water depth. Time is measured in minutes; the output is measured in centimetres. Straight segments join the exact data points. Work strictly inside the stated segment, not at a corner
| \(t\) | \(Q(t)\) |
|---|---|
| \(0\) | \(20\) |
| \(1\) | \(18\) |
| \(3\) | \(22\) |
| \(4\) | \(22\) |
\[t=2\]