This is a task from the Illustrative Mathematics website that is one part of a complete illustration of the standard to which it is aligned. Each task has at least one solution and some commentary that addresses important asects of the task and its potential use. Here are the first few lines of the commentary for this task: In science class, Mrs. Winkler’s students are studying the water flow in a channel close to their school (see the photo below found here). A cross sect...

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