anonymous
  • anonymous
HELP! :( The 50th term of an arithmetic sequence is 86, and the common difference is 2. Find the first three terms of the sequence
Mathematics
  • Stacey Warren - Expert brainly.com
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SOLVED
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schrodinger
  • schrodinger
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anonymous
  • anonymous
\[t _{n}=a+(n-1)d,86=a+(50-1)*2,a=?\] this is first term next two terms are a+2,a+2+2
anonymous
  • anonymous
Thank you! :)
refrac532
  • refrac532
This is an arithmetic sequence involving only whole numbers...how did you get a decimal?

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refrac532
  • refrac532
You might be thinking about a geometric sequence.
refrac532
  • refrac532
Think about it this way: If 86 is the 50th term, and 2 is the common difference, then what would the 49th term be?
refrac532
  • refrac532
Remember: arithmetic sequence. It only adding or subtracting to get to the next term.
refrac532
  • refrac532
it only requires*
refrac532
  • refrac532
Close! But you're just a little bit off.
refrac532
  • refrac532
Try this: \[a _{n} - n(d)\] where \[a _{n}\] is the nth term, n is the term (50), and d is the common difference.
anonymous
  • anonymous
-14!?
refrac532
  • refrac532
Correct!
refrac532
  • refrac532
Oh my god I am so sorry it is -12
refrac532
  • refrac532
I miscalculated xD
refrac532
  • refrac532
SORRY

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