Posted by Angela on Sunday, November 6, 2011 at 10:15am.
use the associative law of addition to write an equilalent expression
(r+st)+8

algebra  MathMate, Sunday, November 6, 2011 at 10:21am
In addition, you can place parentheses in any order without changing the results.
For example,
(2+4)+6
gives the same result as
2+(4+6)
By applying the above associative law, you will be able to write an equivalent expression from the given one.
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