Understand functions as mappings from inputs to exactly one output; connect f(x) to graph y=f(x).
Identify input and output quantities in a context
Problem
In the context total cost depends on number of tickets bought, identify the input and output quantities.
Big Picture
What this problem is really about
Turn the phrase “depends on” into a one-way arrow between the two quantities. The quantity supplied or controlled first is the input, and the quantity determined in response is the output. We’ll confirm the direction by asking which known value lets us calculate the other, then attach the proper units.
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