this is a particularly problematic problem because what it looks like to me is that each scientist's predictions are based on a different predicted number of mussels in the area, and the functions are predicting thespreadof mussels, which I don't understand.

Can anyone explain what these mean to me?

Also what conclusions would I be able to draw from a difference function? I'm speaking conceptually what could i learn from any given difference function

Thanks so much if you can help, because I really need it