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Algebra / Linear inequalities in one or two variables Difficulty: Easy

During a portion of a flight, a small airplane's cruising speed varied between $150$ miles per hour and $170$ miles per hour. Which inequality best represents this situation, where $s$ is the cruising speed, in miles per hour, during this portion of the flight?

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Explanation

Choice D is correct. It's given that during a portion of a flight, a small airplane's cruising speed varied between $150$ miles per hour and $170$ miles per hour. It's also given that $s$ represents the cruising speed, in miles per hour, during this portion of the flight. It follows that the airplane's cruising speed, in miles per hour, was at least $150$ , which means $s greater than or equals 150$ , and was at most $170$ , which means $s less than or equals 170$ . Therefore, the inequality that best represents this situation is $150 \leq s \leq 170$ .

Choice A is incorrect and may result from conceptual or calculation errors.

Choice B is incorrect and may result from conceptual or calculation errors.

Choice C is incorrect and may result from conceptual or calculation errors.