Question
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With new batteries, Jayce's camping flashlight can work for up to 14 hours before it runs out of power. He just put new batteries in and has already used the flashlight for 3 hours. Let x represent how many more hours Jayce can use his flashlight before running out of power. Which inequality describes the problem?

Ask by Ryan Knight. in the United States
Jan 23,2025

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Answer

\( 3 + x \leq 14 \)

Solution

To determine how many more hours Jayce can use his flashlight before the batteries run out, let's break down the information: 1. **Total Capacity:** The flashlight can work for up to **14 hours** with new batteries. 2. **Already Used:** Jayce has already used the flashlight for **3 hours**. 3. **Remaining Time:** Let **\( x \)** represent the number of additional hours he can use the flashlight. The combined usage (already used plus additional usage) should not exceed the total capacity: \[ \text{Already Used} + \text{Additional Usage} \leq \text{Total Capacity} \] Substituting the known values: \[ 3 \, \text{hours} + x \leq 14 \, \text{hours} \] **Final Inequality:** \[ 3 + x \leq 14 \] This inequality accurately represents that the total usage (3 hours already used plus \( x \) additional hours) must be at most 14 hours. **Answer:** \( 3 + x \leq 14 \)

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Bonus Knowledge

Jayce can use his flashlight for a total of 14 hours, and since he's already used it for 3 hours, he has 11 hours left before the flashlight runs out of power. Mathematically, this can be expressed as \( x + 3 \leq 14 \). This means the total amount of time (the hours left, x, plus the 3 hours already used) cannot exceed the 14-hour limit. To ensure Jayce makes the most of his flashlight, he should keep an eye on how much time he’s using it. A common mistake is forgetting to track the time, which can leave him in the dark! Setting a timer can help prevent overuse, ensuring he finishes his camping adventures with sufficient light.

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