The answer is d
Since you do 8/24
It is not periodic. A periodic dataset is a dataset that repeats the same pattern over time.
Answer:


Step-by-step explanation:
Lets call
the the still-air speed of the plane and
the speed of the wind. On the first part the speed of the plane relative to the ground will be
, and on the second part it will be
.
We know that the distance d=400 miles on the first and second parts are the same, so by the definition of velocity we will have:


Or:


Adding both equations:


Which for our values is:

If instead of adding, we substact, we would have:


Which for our values is:
