Use function notation, evaluate functions on their domains, and interpret notation in context.
Interpret input and output units in function notation
Problem
\(C(n)\) is the total cost in dollars for \(n\) tickets, and \(C(4)~=~28\). Identify the input and output roles with units, then state the ordered pair.
Big Picture
What this problem is really about
Use the function’s definition to attach a quantity and unit to each side of the mapping. The value inside parentheses inherits the input variable’s unit, while the function value inherits the output quantity’s unit. We’ll then write the contextual ordered pair with the input first and distinguish a total amount from any per-unit rate.
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