25 points
what is the sum of the series?

-31 (perhaps if I 100% knew what I was doing, but this is what I believe the answer should look like based on my research which consisted of me finding out the mechanics of such expressions from a website I found online)

Step-by-step explanation:

I have never had to solve a question like this, so my answer is to be taken with a grain of salt (bucket full).

When we see that funky symbol over there, we're going to want to do some funky things:

6

∑(-2k + 5)

k=3

So we'll substitute 3 for k, as seen here:

(-2(3) + 5)

But wait! We still got that 6, so we'll throw that in with the 3:

(-2(3 · 6) + 5)

From here, we PEMDAS or whatever you prefer until we're done!

(-2(18) + 5)

(-36 + 5)

(-31)

-31

[Processing ends successfully.. Just kidding, I ain't no robot!]

is there any answers choices? l can try to you if there is answer choices to this question,so sorry