Combine standard functions using arithmetic operations to build models.
Choose the function operation that matches a context
Problem
State the function operation that combines two separate fees \(f(x)\) and \(g(x)\) into a total cost.
Big Picture
What this problem is really about
The context determines how function outputs should be combined. We’ll identify whether the requested quantity is a total, difference, product, or per-unit comparison, require both fee outputs to refer to the same input, and track their units through each possible operation. A simple pair of sample fees then checks which operation produces the ordinary combined cost described.
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