According to the site Math Planet, 'A compound inequality contains at least two inequalities that are separated by either "and" or "or".'
In the case of "and", a compound inequality such as
x > -1 and x < 2
can also be written as:
-1 < x < 2
(I also took this example from Math Planet.)
There is no such shortcut for the "or" case.
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An inequality is when a variable and its coeefecient is greater than something. For example, 5x is greater than 2.
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This compound inequality cannot be solved.
Substance is a compound of dookie and multiplication
It is a collection of terms which are combined using various mathematical operations such as addition, subtraction, multipplication, division, power, inverse, trigonometric functions etc. It does not have an equality of inequality relationship - which would make it an equation or inequality.