Could you please explain #20,practice test 9,calculator?

To get this one, you need recognize that if you have ZERO servings of cereal, then you’ll be getting ZERO calories from fat. So the graph needs to go through the origin–i.e., it needs to contain (0, 0).

That only happens in one choice so you can kinda stop there, but the other insight that is helpful is that the more servings of cereal you eat, the more calories you’re eating, so the graph should have a positive slope.

So you want the choice with a positive slope that goes through the origin. That’s choice A!