Posted by **Mike** on Tuesday, November 3, 2009 at 7:30pm.

simplify the expression by combining like terms

r + 2s + 3r

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**Nicole**, Tuesday, November 3, 2009 at 7:36pm
Well since both the 'r's are like terms, you'd combine them, and don't forget that there is a 1 in front of each variable, so you'd add 3 + 4 and have 4r.

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**Nicole**, Tuesday, November 3, 2009 at 7:37pm
OH sorry typo!

3 +1 and you'd have 4r! sorry!

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**Mike**, Tuesday, November 3, 2009 at 7:43pm
How do you combine the r's?

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**Mike**, Tuesday, November 3, 2009 at 7:51pm
Nicole, Thanks but I do not understand

how do you combine the r's?

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**Nicole**, Tuesday, November 3, 2009 at 7:55pm
you would combine the r's just by adding them together, because they are the same variable. The first r in the equation doesn't have a number with it, right? So since it isn't attatched to a number, pretend that there is an invisible 1 in front of it. So when you add the two r's together then you get 4r right? So pretend instead that the equation reads:

1r + 2s + 3r

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**Ms. Sue**, Tuesday, November 3, 2009 at 7:56pm
4r + 2s

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**Nicole**, Tuesday, November 3, 2009 at 7:57pm
exactly =)

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