Answer
See the image below.
Work Step by Step
The image above roughly represents the height of lawn throughout $4$-week period.
The lawn is mowed weekly, every Wednesday, that is the middle of the week. The graph begins from a Sunday, which means that $3$ days have passed after last mow; the lawn is approximately grown half of the maximum height.
The height gets bigger as time passes and on Wednesday we have a jump on the graph; the day when lawn is mowed.