## Adam1994 3 years ago Hey who wants to help with this one?

$\sum_{i--4}^{-2}-4i$

2. AnimalAin

Just add them up.$\sum_{k=-4}^{-2}-4k=-4\sum_{k=-4}^{-2}k=-4(-4+-3+-2)=36$

3. AnimalAin

As you can see, I prefer k as my index....

Thank you very much :D

5. AnimalAin

You've got it now?