Final answer:
Using 20.5 as a domain value for the algebraic rule C(s)=15+2s does not make sense because staplers are indivisible items, and the number of staplers ordered should be a whole number.
Step-by-step explanation:
You asked whether it makes sense to use 20.5 as a domain value for the algebraic rule C(s)=15+2s, where C(s) represents the total cost for staplers in dollars for the entire school, and s represents the number of staplers ordered. In this context, using 20.5 as a domain value does not make sense because staplers are discrete items that cannot be divided. One cannot order half a stapler; therefore, the domain for s must consist of only whole numbers.
Consider this analogy as well: if the equation were representing buying bus tickets where each ticket is discrete as well, you couldn't buy half a ticket. Similarly, in financial distributions, it is not possible for the probabilities to sum up to more than 1, much like how you cannot order half a stapler. Thus, the domain values for s should be limited to positive integers only.