Problem

Build the average-cost model for a $\$300$ bus fee plus $\$18~\text{per}~\text{student}$ for $x~\text{students}$. State the contextual domain, interpret the components, and give the long-run cost per student.

Answer choices

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Model: A(x)=300/x+18. Domain: positive whole x. Components: bus fee per student plus $18 ticket cost. Limit: $18 per student.

Model: A(x)=300+18x. Domain: positive whole x. Components: total bus and ticket costs. Limit: $18 per student.

Model: A(x)=300/x+18. Domain: every nonzero real x. Components: two ticket costs per student. Limit: $18 per student.

Model: A(x)=300/x+18. Domain: positive whole x. Components: bus fee per student plus $18 ticket cost. Limit: $300 per student.

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