Final answer:
Igloo Ice has the lowest delivery charge among the three ice cream shops.
Step-by-step explanation:
To determine which store has the lowest delivery charge, we need to compare the delivery fees for each store. The delivery fee is the constant term in each pricing plan. Let's compare:
Igloo Ice: C(n) = 1.75n + 75
Fred's Freeze: C(n) = 2n + 80
Tasty Treats: C(n) = 1.25n + 90
From the equations, we can see that Igloo Ice has the lowest delivery charge of $75, while Fred's Freeze has a delivery charge of $80, and Tasty Treats has the highest delivery charge of $90. Therefore, Igloo Ice has the lowest delivery charge among the three stores.