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britbrat4290

PLZ HLP!:) The weekly sales in thousands of items of a product has a seasonal sales record approximated by (t is time in weeks with t = 1 referring to the first week in the year). During which week(s) will the sales equal 96,990 items?

  • 8 months ago
  • 8 months ago

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  1. britbrat4290
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    • 8 months ago
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  2. Coolsector
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    ok so what did you try to do ?

    • 8 months ago
  3. britbrat4290
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    im ost in this cant u cant lol im forced to take a high school calc class and this isnt even calc fml i just cant fail this last test

    • 8 months ago
  4. britbrat4290
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    lost

    • 8 months ago
  5. britbrat4290
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    i know how to plug in formulas thats about it to be honest

    • 8 months ago
  6. Coolsector
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    im sorry to hear that :( anyway you have this equation that you gave me it describes the amount of itmes for a given t (week)

    • 8 months ago
  7. Coolsector
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    you look for a certain amount of items and find the corresponding t

    • 8 months ago
  8. britbrat4290
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    ok

    • 8 months ago
  9. britbrat4290
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    plug in one for t for everything

    • 8 months ago
  10. Coolsector
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    no, you want to find t

    • 8 months ago
  11. britbrat4290
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    im 23 this is sad

    • 8 months ago
  12. Coolsector
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    im 23 as well .. it is fine

    • 8 months ago
  13. britbrat4290
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    but i thought it says t=1 in the problem

    • 8 months ago
  14. britbrat4290
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    :)

    • 8 months ago
  15. Coolsector
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    no, they say that t=1 means the first week

    • 8 months ago
  16. britbrat4290
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    ahh gotcha

    • 8 months ago
  17. Coolsector
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    now when you find t , for example if you find t = 10 you know that it is the 10th week in year

    • 8 months ago
  18. Coolsector
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    now, you got the equation : n=84.59 + 24.8sin(pi*t/24)

    • 8 months ago
  19. Coolsector
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    and they ask you for what weeks n = 96,990

    • 8 months ago
  20. britbrat4290
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    i got undefined ...

    • 8 months ago
  21. Coolsector
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    so you have to solve: 96,990 = 84.59 + 24.8sin(pi*t/24) i guess here 84.59 means 84590 and 24.8 means 24800

    • 8 months ago
  22. Coolsector
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    so it is really should be : 96.99 = 84.59 + 24.8sin(pi*t/24)

    • 8 months ago
  23. Coolsector
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    since they say "n is in thousands of items"

    • 8 months ago
  24. britbrat4290
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    im getting a crazy calculation

    • 8 months ago
  25. Coolsector
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    why, look: 96.99 = 84.59 + 24.8sin(pi*t/24) 12.4 = 24.8sin(pi*t/24) 0.5 = sin(pi*t/24)

    • 8 months ago
  26. britbrat4290
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    week 4, week 20, and week 52?

    • 8 months ago
  27. Coolsector
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    wait ill check :)

    • 8 months ago
  28. Coolsector
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    0.5 = sin(pi/6) so : sin(pi/6) = sin(pi*t/24) 1. pi*t/24 = pi/6 + 2pi*k t = 4 + 48*k t = 4 , 52 2. pi*t/24 = pi - pi/6 + 2pi*k t = 20 + 48*k t=20 so yes! 4 20 52

    • 8 months ago
  29. britbrat4290
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    yay ur being my life saver right now!!!

    • 8 months ago
  30. britbrat4290
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    THANK U SOO MUCH

    • 8 months ago
  31. Coolsector
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    yw :))

    • 8 months ago
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