Answer:- 4.5 grams per cup
Step to step explanation:-
Given: The amount of fat, in grams, in granola is proportional to the volume, in cups, of the granola.
From the graph, we can see
The amount of fat in 4 cups in granola =18 grams
Therefore, the amount of fat in 1 cup=

Therefore, the unit rate in grams per cup= 4.5 grams per cup