Find S20 for the series -1 + -3 + -5 + -7 +... help?

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Find S20 for the series -1 + -3 + -5 + -7 +... help?

Mathematics
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You have formula for this, what is it? Notice: S means sum
s=-1-2n
I don't get. Use draw button to jot it down, please

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Other answers:

|dw:1439655417621:dw|
https://www.mathsisfun.com/algebra/sequences-sums-arithmetic.html
you need find d. What is d? the difference between 2 consecutive numbers.
|dw:1439655734476:dw|
-2
s20=-39
Your series starts from \(a_1 \) and ends at \(a_{20}\), right? that means you have 20 elements there, right? That is n =20 Now plug all in \(S_{20}= \dfrac{n}{2}(2a_1+(n-1)*d)\) What do you get?
whats a1
i got -420?
a_1 is the first number: -1
-400
yes, hihihi... I am sorry.
-400?
yes
Let's test
hit your calculator -1-3-5.......-39=?
yep
yES, I got -400

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