Which of the following is a **strict inequality**?
A$x \leq 5$
B$x \geq 0$
C$x = 4$
D$x < 7$
Answer & Solution
Correct answer: D. $x < 7$
Strict inequalities use $<$ or $>$ (no equality). Slack inequalities use $\leq$ or $\geq$. Option D is an equation, not an inequality.
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