Final answer:
When the side length of the hexagon is 4 tiles (n = 4), the number of green-colored tiles in the border, using the formula 6n + 3, would be b)27.
Step-by-step explanation:
The question involves calculating the number of green-colored tiles that would form the border of a hexagon when each side of the hexagon is 4 tiles long. The formula given for the border is 6n + 3, where n represents the number of tiles on each side of the hexagon.
When n = 4, we plug the value of 4 into the formula:
6n + 3 = 6(4) + 3 = 24 + 3 = 27.
Therefore, with n = 4, there would be option b:27 green-colored tiles in the border of the hexagon.