The expression \( 6 - x \) represents a situation where a value (6) is decreased by an unknown amount (\( x \)). Here are the situations from the provided options that fit this description:
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Six servings of dinner were decreased by a number. - This corresponds directly to \( 6 - x \) where \( x \) is the number of servings decreased.
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Gabrielle decreased her 6-minute mile by an unknown amount of time. - This situation reflects \( 6 - x \) where \( x \) represents the unknown amount of time decreased from her 6-minute mile.
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Westville has 6 fewer schools than Eastville. - This also fits as it can be interpreted as stating that if Eastville has \( x \) schools, then Westville has \( 6 - x \).
The other situations provided do not fit the expression \( 6 - x \) as they either do not involve an unknown amount being subtracted from 6 or do not represent a situation involving the initial number being 6.
To summarize, the three situations that apply are:
- Six servings of dinner were decreased by a number.
- Gabrielle decreased her 6-minute mile by an unknown amount of time.
- Westville has 6 fewer schools than Eastville.