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Chapter 1: Q47. (page 45)

On some interstate highways, the maximum speed a car may drive is 65 miles per hour. A tractor-trailer may not drive more than 55 miles per hour. The minimum speed for all vehicles is 45 miles per hour.

Write an inequality to represent the speed at which a tractor-trailer may travel on an interstate highway.

Short Answer

Expert verified

45≤s≤55

Step by step solution

01

– Description of step.

A maximum speed of tractor-trailer on interstate highway is 55 miles per hour and a minimum speed for tractor-trailer on interstate highway is 45 miles per hour.

02

– Description of step.

To represent the speed of a tractor-trailer in the form of an inequality, we need to define a variable for a speed of a tractor-trailer.

Let s be the speed of tractor-trailer.

03

– Description of step

Write an inequality using the information in step 1 to represent the speed at which tractor-trailer may travel on an interstate highway.

45≤s≤55

Therefore, the speed at which tractor-trailer may travel on an interstate highway is 45≤s≤55.

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