Final answer:
To determine if the teachers have enough money to buy cups and napkins, one would need to know the price of each item. A numerical expression for the total cost would be the sum of the cost of the cups and the cost of the napkins. Without this information, we cannot evaluate if additional money is necessary.
Step-by-step explanation:
The student's question pertains to identifying greater and lesser monetary amounts when planning to purchase supplies with a given budget. The teachers have a total of $25 to spend and need to calculate if this is enough to buy cups and napkins. Unfortunately, the student has not provided the exact costs of the cups and napkins for us to create a numerical expression. To answer the question, one would need to know the cost of each item they wish to purchase. Then, a numerical expression could be written to represent the total cost, such as:
Total cost = (number of cups × cost per cup) + (number of napkins × cost per napkin).
Without specific prices, we cannot evaluate the numerical expression to determine how much more money, if any, the teachers would need to buy the cups and napkins.