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anonymous

  • one year ago

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…?

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  1. welshfella
    • one year ago
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    for the first one calculate second term / first term and third term / second term what do you notice?

  2. Kash_TheSmartGuy
    • one year ago
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    1. 1875 2. Dividing by 2.

  3. anonymous
    • one year ago
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    for the first one i think it is an = a1 * (1/2)(n-1), a1 = 8 btw

  4. welshfella
    • one year ago
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    @Kash_TheSmartGuy please don't give direct answers - read the code of conduct

  5. Kash_TheSmartGuy
    • one year ago
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    Sorry

  6. anonymous
    • one year ago
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    But the second ones answer isn't on the choices

  7. welshfella
    • one year ago
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    the first one is a geometric sequence where the next term is obtained by multiplying by a common ratio

  8. welshfella
    • one year ago
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    the second one is also geometric - do you know what the nest number is?

  9. anonymous
    • one year ago
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    you mean next

  10. anonymous
    • one year ago
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    and I think it should be .5

  11. welshfella
    • one year ago
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    yes not nest!!

  12. welshfella
    • one year ago
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    right each term is formed by multiplying by 0.5 - same thing as dividing by 2 as Kash said

  13. welshfella
    • one year ago
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    and if you do the divisions i mentioned in my first post you'll get the common ratio for the first sequence

  14. welshfella
    • one year ago
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    and to get the next term you multiply -375 by this common ratio

  15. anonymous
    • one year ago
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    an = a1 * (1/2)(n-1), a1 =8 I guess maybe

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