Problem to discuss over Thanksgiving week

Hello all,

I know several of us are able to be off a few extra days this week, so I thought we should capitalize on this time and discuss a problem:

Also, if you want to make their own graphs, choosing the topic of the graph and the 2 dimensions it varies along, and then post the link so we can "see" it.

This graph comes from Dr. Jo Boaler's website: https://bhi61nm2cr3mkdgk1dtaov18-wpengine.netdna-ssl.com/wp-content/uploads/2017/03/WIM2-Day-2-9-12.pdf