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christinewilliams Group Title

given the terms a1 = 5 and a 4= 14 of an arithmetic sequence what is a20

  • one year ago
  • one year ago

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  1. ghazi Group Title
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    \[T _{20}=a _{1}+(n-1)d\] we need d

    • one year ago
  2. ghazi Group Title
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    now, \[a _{4}=a _{1}+(n-1)d, a _{4}=5+(4-1)d, 14=5+(3)d\] find d and you will have T 20 :)

    • one year ago
  3. ghazi Group Title
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    \[T _{20}=5+(20-1)d\]

    • one year ago
  4. christinewilliams Group Title
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    wait..... it is multiple choice it could be 62, 65,171, 185

    • one year ago
  5. ghazi Group Title
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    well calculate it :) your d=3 i guess then put d in the equation and find it :)

    • one year ago
  6. christinewilliams Group Title
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    wait what?? so t20=5+(19)3

    • one year ago
  7. ghazi Group Title
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    correct

    • one year ago
  8. christinewilliams Group Title
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    I got 62

    • one year ago
  9. ghazi Group Title
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    thats the answer :)

    • one year ago
  10. christinewilliams Group Title
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    awesome thank you!!! can you help me with more!!! i am so behind in my math class!

    • one year ago
  11. ghazi Group Title
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    keep posting :) don't follow up

    • one year ago
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