Final answer:
The question is about comparing two long-distance phone plans in terms of charges and costs.
Step-by-step explanation:
The subject of this question is Mathematics, specifically related to a comparison between two long-distance phone plans. The question asks about the charges and costs associated with each plan.
Phone plan A has a $100 sign-up fee and charges 3 cents per minute, while phone plan B has no sign-up fee but charges 5 cents per minute.
To determine the better value, you can compare the total cost of each plan based on the number of minutes used for a certain period.