I don't know what I did wrong? Sigma notation.. partial sums... see attached.

Question

anonymous · Answer

attachmen?

luigi0210 · Answer

I don't see anything D: 
I must be losing my sight

anonymous · Answer

we cannot help you if you do not show us the problem

anonymous · Answer

@isael @Luigi0210

anonymous · Answer

That is the question and work, but my answer isn't one of my choices...?

luigi0210 · Answer

I think it's just asking for the 5th term?

anonymous · Answer

No that isn't one of the multiple choice answers either ): 

These are the answers they give:
A. 55

B. 60

C. 65

D. 70

luigi0210 · Answer

@tcarroll010 help me out D:

anonymous · Answer

b ;60 you solved wrong

luigi0210 · Answer

actually he's right it was an addition error, but I got 70 :/

amistre64 · Answer

70 is correct

amistre64 · Answer

how did you add to get 106?

amistre64 · Answer

or 60 for that matter :/

anonymous · Answer

wow -.- how did that happen? I used a calculator... Lol thanks though guys!!!

anonymous · Answer

no problem :)

anonymous · Answer

but the answer is 60 i double checked

amistre64 · Answer

-1 + 5(1)
-1 + 5(2)
-1 + 5(3)
-1 + 5(4)
-1 + 5(5)
-----------
5(-1) + 5(1+2+3+4+5)

-5 + 5(10+5)

-5 + 50 + 25

50 + 20 = 70

anonymous · Answer

^^ right. Got it! Thanks... Blonde moment haha

luigi0210 · Answer

Looks like some of us need to learn addition again >.>

luigi0210 · Answer

Including me xD

anonymous · Answer

-1+5 is 4 
4(1)=4
4(2)=8
4(3)=12
4(4)=16
4(5)=20
add all of the answers and is 60

amistre64 · Answer

isael, you cant just disregard the order of operations.....

luigi0210 · Answer

someone made a booboo

amistre64 · Answer

its not:  (-1+5) (n)