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Which symbol writes the solution of a compound inequality joined by or?
AThe equals symbol
BThe product symbol
CThe union symbol
DThe percent symbol
Answer & Solution
Correct answer: C. The union symbol
1. Solve the two inequalities separately, as always.
2. With or, a number qualifies by satisfying either one of them.
3. The two separate solution sets are therefore put together rather than overlapped.
4. Interval notation writes that combination with the union symbol.
5. An equals symbol would claim the two sets are the same, which they are not.
_Source: OpenStax Intermediate Algebra (CC BY 4.0), Ch 2 "Solving Linear Equations", section 2.6 Solve Compound Inequalities_