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The speed limit on a certain stretch of the highway is 70 miles per hour. A state trooper is pulling everyone over who isn't driving within 7 mph of the speed limit. Which inequality shows all the possible speeds, [tex]\(s\)[/tex], that a person can drive past the state trooper without getting pulled over?

A. [tex]|s-70| \leq 7[/tex]
B. [tex]|s-7| \leq 77[/tex]
C. [tex]|5+63| \leq 7[/tex]
D. [tex]|s+7| \leq 63[/tex]


Sagot :

Let's carefully analyze the problem step-by-step to determine the correct inequality.

1. Identify the speed limit and the range of acceptable speeds:
- The speed limit on the highway is 70 mph.
- Drivers have to stay within 7 mph of this speed limit to avoid getting pulled over.

2. Express the acceptable speed range using an absolute value inequality:
- If [tex]\( s \)[/tex] is the speed a person drives, the distance of [tex]\( s \)[/tex] from the speed limit 70 should be less than or equal to 7 mph. This can be written using the absolute value as:
[tex]\[ |s - 70| \leq 7 \][/tex]

3. Verify the inequations:
- Option A: [tex]\(|s-70| \leq 7\)[/tex]
- This correctly represents that the speed [tex]\(s\)[/tex] can deviate by at most 7 mph from the speed limit of 70 mph.
- Option B: [tex]\(|s-7| \leq 77\)[/tex]
- This does not correctly represent the deviation around the speed limit of 70 mph. It implies that [tex]\(s\)[/tex] can vary widely from 7 mph, which is incorrect.
- Option C: [tex]\(|5+63| \leq 7\)[/tex]
- This simplifies to [tex]\(|68| \leq 7\)[/tex], which is a fixed false statement.
- Option D: [tex]\(|s+7| \leq 63\)[/tex]
- This does not correctly account for the speed limit and the acceptable range around it.

Based on the analysis above, the correct inequality that shows all the possible speeds a person can drive past the state trooper without getting pulled over is:
[tex]\[ \boxed{A. \ |s-70| \leq 7} \][/tex]