To sketch: A rough graph of the height of the grass as a function of time over the period of four weeks.
Let the time over four hour-week period (four Wednesdays) represented in the x-axis and the height of the grass over the week represented in the y-axis.
Generally, as days increases the length of the grass increases. Thus, the graph of the height of the grass as a function of time over the course of a four hour-week period is shown below in Figure 1.
In Figure 1, the open dot indicates that the point is excluded and the closed dot indicates that the point is included.
Note: The height of the grass for every week is not necessary to be same in length. So, the graph may vary depends on the grass height.
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