Compound inequalities are inequalities that have more than one sign, for example, 5<2x+3<9. Another example is 3x>9 or 3x<3.
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An inequality with "and" is true if BOTH inequalities are true. Inequality with "or" is true if ONE of the inequalities are true.
Yes
It means that both inequalities must be satisfied.
1/2x+5<4+2/5x
represent x > 6 and x <=18 enter the compound inequality without using and