anonymous
  • anonymous
Which sequences are geometric? Check all that apply. –2, –4, –6, –8, –10, … 16, –8, 4, –2, 1 –15, –18, –21.6, –25.92, –31.104, … 4, 10.5, 17, 23.5, 30, … 625, 125, 25, 5, 1, …
Mathematics
schrodinger
  • schrodinger
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Defiance
  • Defiance
@apalmer004 The last question you asked on the others, Number 2 was not one of them, only the last 2. Sorry.
misty1212
  • misty1212
weird i swear i just saw this exact question
Defiance
  • Defiance
Misty will be able to help you here, I gotta go to the movies

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misty1212
  • misty1212
what are you going to see?
anonymous
  • anonymous
do you know the answer? @misty1212
misty1212
  • misty1212
see which ones have a "common ratio" i.e if you divide one term by the previous one, you always get the same number
misty1212
  • misty1212
not \[–2, –4, –6, –8, –10, …\] since there you are subtracting 2 each time, so it is "arithmetic"
misty1212
  • misty1212
\[16, –8, 4, –2, 1\] is geometric since \[\frac{-8}{16}=\frac{8}{-8}=\frac{-2}{4}=\frac{-1}{-2}\] all the ratios are \(-\frac{1}{2}\)
misty1212
  • misty1212
typo there, i meant \[\frac{-8}{16}=\frac{4}{-8}=\frac{-2}{4}=\frac{-1}{-2}\]
misty1212
  • misty1212
for \[–15, –18, –21.6, –25.92, –31.104, … \] check using a calculator if \[\frac{-18}{-15}=\frac{-21.6}{-18}=\frac{-25.92}{-21.6}\]

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