-15r + 3(2s - 4r) = -19r+6s right?

i am pretty sure i've been doing my work correctly but i want to double check in case i fail this section.
i combined like terms and i got the answer. is that what i'm supposed to do?

 

-27r+6s

I don't know what you did.

 

wrong
6s- 27r

 

i see what i did wrong there, i forgot to multiply the 4. i apparently did the rest correctly though. thanks
i used a 4 instead of 12 lol oops...

thats not one of the answers >.>

 

he's trying to be funny

 

You got -15r + 3(2s - 4r) = -19r + 6s

Arithmetic seems to be slightly off.

I get...

-15r + 6s - 12r (FOIL'd)

-27r + 6s (combine like terms; note opposite signs, I think you missed it a little)

I'm not sure how you got -19r either.

 

You're kdding me right?
6s-27r = -27r+6s
FAIL.

 

because i accidentally got this
-15r + 6s - 4r
which gave me this
-19r + 6s

lol i wasn't understanding. i have only been up for an hour and 12 minutes lol.
not all the way awake...

 

You shouldn't study when your brain is not awake so you just finish earlier. Relax, wake up first and then start studying. And when you're tired from studying, make a 10 minute break, go drink some juice and grab something to eat, and then go to study again.

 

but i am at school...

 

School + internet asking for help from KHV in maths? :P Nice!

 

are you asking during mathclass?

 

lol thanks.

 

Ah I see.

And yeah, it is true due to commutative property of addition kthx ;o

EDIT: Also I'd probably ask KHV if I had trouble on a math problem. Although, really, I wouldn't expect a right answer. I'd just be looking for help mostly. lol

 

yeah, why?
its an online class and we just have a teacher to keep us on task.
not a math teacher...

 

If the right people are on, then yeah there's no problem.

 

it helps me more than most other things do...