Find the indicated sum.

A. 2
B. 54
C. 46
D. -54
I got B

Question

Find the indicated sum. 

 
 A. 2	
 B. 54	
 C. 46	
 D. -54	
I got B

anonymous · Answer

attachment

anonymous · Answer

express the four terms

(-1)(1+11) = -12
(1)(2+11) =  13
(-1)(3+11) = -14
(1)(4+11)  = 15

now, add the numbers up

anonymous · Answer

I got 2, so its A?

anonymous · Answer

yes. 
did you understand how I expanded the terms?

anonymous · Answer

from k = 1 to k = 4

anonymous · Answer

I think so.(: Thank you very much

anonymous · Answer

yw.

anonymous · Answer

you got the numbers right but you missed the $(-1)^k$  part that gives them the signs!

anonymous · Answer

I got others. If you want to check them too. Im on a course that I have to teach myself. :/
I just like this class to graduate. so I want to make a super good grade

anonymous · Answer

Oh man what was I thinking!!! Glad you caught that

anonymous · Answer

post them as questions like this. There are many good people here to help you. 

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