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What is the sum of the first 21 terms of the arithmetic series? −5+(−3)+(−1)+1+... i need help ASAP!!! gave 50 pts!
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What is the sum of the first 21 terms of the arithmetic series?

−5+(−3)+(−1)+1+...

i need help ASAP!!!

gave 50 pts!

User Ziad
by
8.7k points

2 Answers

2 votes
I'm confused, but if you want me to add all the numbers I got negative 8.
User Mladen Milosavljevic
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8.9k points
0 votes

Answer:

The answer is 315

User Simi
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8.4k points
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