anonymous
  • anonymous
Find S25 for -7+ -2 + 3 + 8 +… I got -2275 following but I don't think that's right. Any advice would be awesome! Thanks.
Mathematics
  • Stacey Warren - Expert brainly.com
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SOLVED
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schrodinger
  • schrodinger
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anonymous
  • anonymous
How'd you get that?
anonymous
  • anonymous
Wouldn't it just be 113?
anonymous
  • anonymous
so we know that a1 = -7 tell me what is d ? d = a2 - a1

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anonymous
  • anonymous
when you find d you can find a25: a25 = a1 + (25-1)*d = a1 + 24d
anonymous
  • anonymous
after you find a25 you can find S25 : S25 = 25 * (a1 + a25) / 2
anonymous
  • anonymous
@Coolsector : Your answer is right !:) :D @maddie.jones47563 : Flow the Coolsector s answer !
anonymous
  • anonymous
Okay. Thanks you guys :) @pathosdebater @E.ali @Coolsector

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