This one is tough!!! I'm not actually sure of the answer, either, but here is my opinion:
Let's throw out the two claiming some "incorrect scale"......we can "scale" a graph in most any manner we'd like......!!!! Besides, the graph is "scaled" per the instructions....
But notice......if we chose to "scale" the temperature on the y axis by increments of 1 (like on the x axis), our graph would be extremely "vertical" ("tall").....
So, the correct answer is the last one.......choosing to scale the temperature in units of 50 keeps the vertical component "manageable."
The problem with the "answer" is that the "spread" of the graph doesn't have anything to do with what thing is being plotted on each axis......we could have plotted the temperature on the x axis, as well......it's the "scale" factor that's important.....
Do any other mathematicians have other ideas????
