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anonymous

  • one year ago

A skier has decided that on each trip down a slope, she will do 2 more jumps than before. On her first trip she did 6 jumps. Derive the sigma notation that shows how many total jumps she attempts from her fourth trip down the hill through her twelfth trip. Then solve for how many total jumps she attempts from her fourth trip down the hill through her twelfth trip.

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  1. anonymous
    • one year ago
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    \[\sum_{i=4}^{12}2i+4 ; 180 jumps\]

  2. anonymous
    • one year ago
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    \[\sum_{i=2}^{10}2i+4 ;144 jumps\]

  3. anonymous
    • one year ago
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    \[\sum_{i=2}^{10}4i+2 ; 234 jumps\]

  4. anonymous
    • one year ago
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    \[\sum_{i=2}^{10}4i+2 : 30\]

  5. anonymous
    • one year ago
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    I meant 306 jumps for the last one:)

  6. anonymous
    • one year ago
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    @jim_thompson5910

  7. anonymous
    • one year ago
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    I think that it's either A or B

  8. jim_thompson5910
    • one year ago
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    what made you narrow your choices down to A or B?

  9. anonymous
    • one year ago
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    It says, "she does it 2 more times to I assumed 2x" at least anyways :)

  10. jim_thompson5910
    • one year ago
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    that's correct. The 2i indicates that the number of jumps is increasing by 2 each time

  11. anonymous
    • one year ago
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    Yay :D

  12. jim_thompson5910
    • one year ago
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    notice how they ask ` how many total jumps she attempts from her fourth trip down the hill through her twelfth trip`

  13. jim_thompson5910
    • one year ago
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    they don't want us to start at i = 1

  14. anonymous
    • one year ago
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    ooo I didn't realize that!

  15. anonymous
    • one year ago
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    So it would be a?

  16. jim_thompson5910
    • one year ago
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    yes because it's the only one that starts at i = 4

  17. anonymous
    • one year ago
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    Thanks so much :))

  18. jim_thompson5910
    • one year ago
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    I would practice on how to compute the sum as well

  19. anonymous
    • one year ago
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    Ok I will !

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