Compound inequality for cruise control

​The cruise-control function on Georgina's car should keep the speed of the car within 3 miles per hour of the set speed. The set speed is 54 miles per hour.

The compound inequality that represents the cruise-control function on Georgina's car using the variable s is ?

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The cruise-control needs to be set within 3 mph of 54 mph.

The two numbers that are 3 away from 54 are 51 and 57. The variable s, needs to be between
and including 51 and 54.
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51 ≤ s ≤ 54   {s is between and including 51 and 54}

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