91Ó°ÊÓ

Let the cost of the present is $x$.

The meaning of at least situation: to buy a present that costs at least $5 is as follows: The least is allowed to be 5; it can be 5 or any number greater than 5.

Inequality for at least situation is $xâ‰\yen 5$.

The meaning of at most situations: to buy a present that costs at most 15 is as follows: The most are allowed to be 15; it can be 15 or any number less than 15.

Inequality for at most situations is $x≤15$.

Inequality for at least situation is $xâ‰\yen 5$]and inequality for at most situation is $x≤15$.

Now, use the word ‘and’ and write the compound inequality then solve each inequality as follows:

$xâ‰\yen 5$ and $x≤15$

$5≤x≤15$

Therefore, the compound inequality to describe the given situation is $5≤x≤15$.