Answer: The total number of plants given away is 14
Step-by-step explanation: First Gregory gave 2 plants, on the second year those two friends gave 2 plants each friend, then a total of 4 plants were given away. Lastly the four friends gave 2 plants each which is a total of 8 plants.
I also need help with this one. I don't know what it is. I don't fully understand the two column proof. I might figure it out and edit this answer or put it in comments.