To determine the unit rate of height per day based on the graph, we need to calculate the slope of the line. The slope represents the rate of change of height per day.
Looking at the graph, we can choose two points that lie on the line. Let's consider the point (0, 0) and (4, 16.5).
The vertical change is 16.5 - 0 = 16.5 units, and the horizontal change is 4 - 0 = 4 units.
Slope = Vertical change / Horizontal change = 16.5 / 4 = 4.125
Therefore, the unit rate of height per day based on the graph is 4.125 units per day.