document.write( "Question 339888: How to know if the algebra expression is positive or negative? How use the number line to joing it? for example a + b how to know where of this its positive or negative. \n" ); document.write( "
Algebra.Com's Answer #243536 by Fombitz(32388)\"\" \"About 
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You don't know without knowing the values of a and b.
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