In the model for , what do the envelope, a counter, and the center line represent?
Case context: An envelope and three counters are on the left. Eight counters are on the right.
Question: In the model for , what do the envelope, a counter, and the center line represent?
Sample answer: The envelope represents the unknown variable . A counter represents a known number, or constant. The center line represents the equal sign .
Key points:
- Envelope: variable or unknown
- Counter: constant or known number
- Center line: equal sign
Rubric: Full credit: Correctly identifies all three parts. Partial credit: Correctly identifies one or two parts.
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