anonymous
  • anonymous
What is the next term in the following sequence: 3, -15, 75, -375…? What is the rule for the following sequence: 8, 4, 2, 1…?
Mathematics
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SOLVED
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katieb
  • katieb
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welshfella
  • welshfella
for the first one calculate second term / first term and third term / second term what do you notice?
Kash_TheSmartGuy
  • Kash_TheSmartGuy
1. 1875 2. Dividing by 2.
anonymous
  • anonymous
for the first one i think it is an = a1 * (1/2)(n-1), a1 = 8 btw

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welshfella
  • welshfella
@Kash_TheSmartGuy please don't give direct answers - read the code of conduct
Kash_TheSmartGuy
  • Kash_TheSmartGuy
Sorry
anonymous
  • anonymous
But the second ones answer isn't on the choices
welshfella
  • welshfella
the first one is a geometric sequence where the next term is obtained by multiplying by a common ratio
welshfella
  • welshfella
the second one is also geometric - do you know what the nest number is?
anonymous
  • anonymous
you mean next
anonymous
  • anonymous
and I think it should be .5
welshfella
  • welshfella
yes not nest!!
welshfella
  • welshfella
right each term is formed by multiplying by 0.5 - same thing as dividing by 2 as Kash said
welshfella
  • welshfella
and if you do the divisions i mentioned in my first post you'll get the common ratio for the first sequence
welshfella
  • welshfella
and to get the next term you multiply -375 by this common ratio
anonymous
  • anonymous
an = a1 * (1/2)(n-1), a1 =8 I guess maybe

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