"Reflection" means that an object is the mirror image of it.
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In Algebra, "is" means Equal (=).
Since "pre-" means before, then pre-algebra would be before algebra. Conversely, algebra would be after pre-algebra. Generally, the next class after a pre-algebra class would be Algebra I, followed by Algebra II.
Normally it means to multiply....
The word 'Algebra' is Arabic in origin, as 'A; Jebr', and means 'The Union of broken parts. The roots of algebra can be tracted back to Babylon approximatelt 1700 BC. Modern algebra was first used in the 16th Century,
the inverted U means and. the U means or.