It means that both inequalities must be satisfied.
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A compound inequality would be a combination of two or more inequalities, combined with AND or with OR. This can be implied, as in 2 < x < 5, which means: 2 < x AND x < 5.
If the absolute value inequality is of the form where the absolute value of the difference between a variable (X) and some constant (a) is compared to another constant (b) eg |X - a| compared with b, then if the comparison is < or ≤, the compound inequality is a double inequality of the form c < X < d (or ≤), and if the comparison is > or ≥, the compound inequality is a disjoint inequality of the form X < c or X > d (or including the equals). In both cases, c = b - a, d = b + a (>c)
represent x > 6 and x <=18 enter the compound inequality without using and
An inequality with "and" is true if BOTH inequalities are true. Inequality with "or" is true if ONE of the inequalities are true.
It is an equation used to anwer an absolute value inequality.