The expression \(6 - x\) represents a situation where a certain quantity (in this case, 6) is decreased by some unknown amount \(x\). Here are the three situations that fit this expression:
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Gabrielle decreased her 6-minute mile by an unknown amount of time.
- This represents \(6\) (the time in minutes) decreased by an unknown time \(x\).
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Six servings of dinner were decreased by a number.
- This represents \(6\) (the servings of dinner) decreased by an unknown number \(x\).
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Westville has 6 fewer schools than Eastville.
- This situation implies that Westville's number of schools can be represented as \(6 - x\), where \(x\) is the number of schools Eastville has.
The other two options do not fit the expression \(6 - x\):
- Sydney increased her collection of coins by six.
- Benjamin lost six of his stickers.
- Naomi gives some of her six pencils away.
These do not represent a decrease from 6; therefore, they do not apply.