Final answer:
The initial height of the purchased plant is 16.5 inches.
Step-by-step explanation:
To determine the initial height of the plant when it was purchased, we need to find the value of H when t is 0.00 months.
From the given table, we can see that when t is 0, H is 16.5 inches. Therefore, the initial height of the plant when it was purchased is 16.5 inches.