Final answer:
The seed's rate of growth is 2/9 feet per month.
Step-by-step explanation:
To find the rate of growth, we need to divide the total growth by the time it took. In this case, the seed grew 2/3 of a foot in 3 months. To find the rate, we divide 2/3 by 3:
Rate of Growth = 2/3 ÷ 3 = 2/9 feet per month
So, the rate of growth of the seed is 2/9 feet per month.