alleryIn the envelope model, the envelope stands for the variable because its contents are:
AUnusual
BUnknown
CUneven
DUnbroken
Answer & Solution
Correct answer: B. Unknown
1. Each counter represents the number one.
2. The envelope hides how many it holds.
3. So its contents are unknown.
_Source: OpenStax Elementary Algebra 2e, Chapter 2, Solving Linear Equations and Inequalities._
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