I think it’s D) 9 because when you find the mean of a set of values you are taking into account and adding all of the numbers, and then dividing them by how many numbers there is, so the mean would be summarizing all of them, hope this helps
Point A' is at (-2,-2)
Point D' is at (-2,4)
Just multiply each coordinate by 2
The length of the trail is 98.5 KM, all you need to do is divide the total distance by the number of times she went on it.
