To solve the inequality \( Cx + 4 \leq 18 \), we can follow these steps:
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Subtract 4 from both sides: \[ Cx \leq 18 - 4 \] \[ Cx \leq 14 \]
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Next, divide both sides by \( C \) (since \( C \) is greater than 0, the inequality direction remains unchanged): \[ x \leq \frac{14}{C} \]
This means the correct solution to the inequality is: \[ x \leq \frac{14}{C} \]
Therefore, the correct answer is: C. \( x \leq \frac{14}{C} \).