A scatterplot shows the relationship between the number of weeks a plant has been growing, , and its height in centimeters, . A line of best fit is shown and has the equation . What does the number 10 represent in the context of this equation?
The plant's height after 2.5 weeks.
The plant's height at the beginning of the observation (0 weeks).
The rate at which the plant grows per week.
The maximum height the plant will reach.
