Question

Sigma notation

Answer 1

@zepdrix help please i think it's A

Answer 2

yes, definitely not C or D:)

Answer 3

I will check

Answer 4

no, incorrect

Answer 5

-135 is correct?

Answer 6

yes, but you guessed it, didn't you?

Answer 7

Wolfram aplha

Answer 8

maybe we can learn how to do it, because wolfram won't help you during a non-online test/exam.

Answer 9

Okay, next post.

Answer 10

sure

Answer 11

as long as learning exists