The print version allows teachers to use the problem with their students without giving the students access to the archived answers.
Teachers can use the link to the archived problem to get ideas about student thinking.
In the Dark with an Elephant asks students to explore how the look of a graph of a function can vary, depending on how the domain and range of the graph window are set. The students will investigate why the same function can sometimes look straight, while at other times it looks curved. Please email us. They should think about pointing the periscope at a certain part of the elephant, and then giving the coordinates that would tell someone else how to aim it. If you use the magnifying glasses at the bottom of the screen, the graph will zoom in and out, helping to illustrate how the change in scale affects the graph.