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.
Calculation:
Year 1: 2 plants plus
Year 2: 4 plants plus
Year 3: 8 plants
Therefore the total is 14 plants.