anonymous
  • anonymous
what is the nth term of the arithmetic series 3+7+11+15+19 Can you please explain to me step by step? Thanks a ton!!
Mathematics
schrodinger
  • schrodinger
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anonymous
  • anonymous
You can see each term increases by 4. The first one is given by taking the term number, multiplying by 4, and subtracting 1. 1x4-1=3 The same for the rest. 2x-4-1=7 So n times 4 minus 1 gives the nth term
anonymous
  • anonymous
that's 2x4
nincompoop
  • nincompoop
TELLING YOU STEP-BY-STEP WILL NOT HELP SO MUCH. YOU HAVE TO READ THIS http://www.regentsprep.org/Regents/math/algtrig/ATP2/ArithSeq.htm

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anonymous
  • anonymous
is there another way to get the nth term, rather then just looking at it and figuring it out?
nincompoop
  • nincompoop
WHEN I GIVE YOU SOMETHING TO READ, READ IT.
DMNTS
  • DMNTS
Answer is: 3+4n When n=0 you get 3, n=1 => 7, n=2 => 11 and so on...
anonymous
  • anonymous
the answer is 4n-1 nincompoop : from the link you gave me, #6 was very similar to my question but I don't think I can look at a problem and figure it out,since the problems will most likely be harder

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