Answer:
C
Step-by-step explanation:
Based on the slope of the graph in front of you, the cost of a shirt that Sarah paid was 15 dollars, you can see where, if you look at where it crosses 2 shirts for 30 and 4 shirts for 60, which is 15 dollars a shirt. Hiliary automatically pays 18 a shirt as shown by the equation. 15<18. so Sarah
