Final answer:
To determine how much more railing Kayden needs, we need to calculate the perimeter of the roof garden based on its dimensions.
Step-by-step explanation:
Kayden has 50 meters of railing and wants to put railing all the way around the roof garden. In order to determine how much more railing Kayden needs, we need to find the perimeter of the roof garden. If the perimeter is greater than 50 meters, then Kayden needs more railing. Given that the answer choices are 12 m, 3 m, 7 m, 10 m, and 20 m, we can calculate the perimeter:
Perimeter = 2*length + 2*width = 2*(length + width)
Here, we are assuming the roof garden is rectangular. Since the question does not provide any additional information, we cannot determine the specific dimensions of the roof garden. Therefore, we cannot calculate the actual perimeter and determine how much more railing Kayden needs. The correct answer would be based on the specific dimensions of the roof garden, which are not given in the question.