How do the authors define/distinguish between Unknown, Variable, and Placeholder.

Words: 124
Pages: 1
Subject: Uncategorized

Please answer the questions below.
1. How do the authors define/distinguish between Unknown, Variable, and Placeholder.
2. What is their purpose in looking at the historical development of unknowns and placeholders?
3. What shifts in thinking do the authors discuss?
4. What are some of the challenges the authors discuss that the students face?

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