Learn the properties, and apply them! What properties you use depends on the specific situations; some examples include:* Combine like terms (terms with the same variables), e.g.: 4x + 5x = 9x
* Factor expressions
* Multiply factors, so you can combine them with other expressions. In a way, this is the opposite of the previous point.
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YES!! You use algebra in your everyday lives. Adding is considered an equation. An equation is a problem with an equal sign. An expression has no answer (an equal sign).
Calculating dimensions of properties.
The algebra teacher was looking for a numeric expressionfor an answer