21. The following data gives the height (in inches) of a sunflower plant as a function of time (days after it was planted).

The height can be modeled by the logistic function:

where H is the height (in.) and t is the time (days). Make a plot of the height versus time. The figure should show the data from the table above as points and the height modeled by the equation as a solid line. Add a legend, and label the axes.