$\"\"$

Let x be the speed on a highway.

The word $\"\"$ minimum $\"\"$ means $\"\"$ greater than or equal $\"\"$ represent the symbol is $\"\"$ .

The word $\"\"$ maximum $\"\"$ means $\"\"$ less than or equal $\"\"$ represent the symbol $\"\"$ .

The word $\"\"$ The minimum speed x on a highway is 40 miles per hour $\"\"$ represent the inequality $\"\"$ .

The word $\"\"$ The maximum speed x on a highway is 60 miles per hour $\"\"$ represent the inequality $\"\"$ .

The word $\"\"$ The minimum speed x on a highway is 40 miles per hour and the maximum speed x is 60 miles per hour $\"\"$ represent the compound inequality $\"\"$ . $\"\"$

The compound inequality is $\"\"$ or $\"\"$ .

The compound inequality $\"\"$ graph is

$\"compound$

Observe the graph, the closed circle means that $\"\"$ are solutions of the inequality. $\"\"$

The compound inequality is $\"\"$ and its graph is

$\"compound$