Which of the following is a **double inequality**?
A$x > 5$
B$x = 4$
C$3 \leq x < 7$
D$ax + b < 0$
Answer & Solution
Correct answer: C. $3 \leq x < 7$
A double inequality bounds the variable on **both sides** simultaneously: $3 \leq x < 7$ means $x$ is at least 3 and less than 7.
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