Asked by Britta

I need to combine like terms. Here are a few questions that I am having trouble with.

-r - 10r

n-4-9

-4+7(1-3m)

Please help ! thank you.
Answered by Ms. Sue
-r - 10r = -11r

n-4-9 = n - 13

-4+7(1-3m) = -4 + 7 - 21m = 3 - 21m


Answered by Jen
-r-10r=-11r (because -1-10=-11)
n-4-9=n-13 (-4-9=-13)
-4+7(1-3m)=-4+7-21m=3-21m