Common difference, in the context of arithmetic sequences is the difference between one element of the sequence and the element before it.
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A harder version of algebra 1
Algebra 1 is a class/course that is on a higher level than Algebra.
There's no such thing as Algebra 3Edit: Yes there is. It is a college level course and when it is offered in high school it's called Algebra Three. The difference is that Algebra 3 is more in depth than Algebra Two is.
Adv. is accelerated most likely.
Pre-algebra preps you for algebra.2nd answer:Pre-AP-algebra is the same as Algebra I. Both are way harder than pre- algebra.