anonymous
  • anonymous
*** WILL MEDAL *** Which sequences are geometric? Check all that apply. –2.7, –9, –30, –100, ... –1, 2.5, –6.25, 15.625, ... 9.1, 9.2, 9.3, 9.4, ... 8, 0.8, 0.08, 0.008, ... 4, –4, –12, –20, ...
Mathematics
  • Stacey Warren - Expert brainly.com
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SOLVED
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chestercat
  • chestercat
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xMissAlyCatx
  • xMissAlyCatx
In mathematics, a geometric progression, also known as a geometric sequence, is a sequence of numbers where each term after the first is found by multiplying the previous one by a fixed, non-zero number called the common ratio.
anonymous
  • anonymous
I dont understand the non zero part :(
anonymous
  • anonymous
Is the 4th one wrong? @xMissAlyCatx

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xMissAlyCatx
  • xMissAlyCatx
I do believe so! And I'm sure the 2nd one is too.
anonymous
  • anonymous
and so is the first one, right? @xMissAlyCatx
xMissAlyCatx
  • xMissAlyCatx
I couldn't find a pattern in it so..
TrojanPoem
  • TrojanPoem
To find if a sequence is either Arithmetic or geometric: Geometric: (A long the whole sequence) \[\frac{ a_{n+1} }{ a_{n} } = const\] Arithmetic: (A long the whole sequence) \[a_{n+1} - a_{n} = const \] So walk through each sequence, like so: 1) \[\frac{ a_{2} }{ a_{1} } = \frac{ -9 }{ -2.7 } = \frac{ 10 }{ 3 } , \frac{ a_{3} }{ a_{2} } = \frac{ -30 }{ -9 } = \frac{ 10 }{ 3}\] (The first sequence is geometric) Can you continue ?
xMissAlyCatx
  • xMissAlyCatx
Thank you @trojanpoem

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