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# Common Core Standard HSA-CED.A.3 Questions

Represent constraints by equations or inequalities, and by systems of equations and/or inequalities, and interpret solutions as viable or nonviable options in a modeling context. For example, represent inequalities describing nutritional and cost constraints on combinations of different foods.

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What x values must be excluded from the domain of $f(x)=(3x)/(7x+21)$?
1. $x=3$
2. $x=-3$
3. $x=0$
4. $x=-7$