anonymous
  • anonymous
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?
Mathematics
katieb
  • katieb
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anonymous
  • anonymous
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anonymous
  • anonymous
ok so what did you try to do ?
anonymous
  • anonymous
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

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anonymous
  • anonymous
lost
anonymous
  • anonymous
i know how to plug in formulas thats about it to be honest
anonymous
  • anonymous
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)
anonymous
  • anonymous
you look for a certain amount of items and find the corresponding t
anonymous
  • anonymous
ok
anonymous
  • anonymous
plug in one for t for everything
anonymous
  • anonymous
no, you want to find t
anonymous
  • anonymous
im 23 this is sad
anonymous
  • anonymous
im 23 as well .. it is fine
anonymous
  • anonymous
but i thought it says t=1 in the problem
anonymous
  • anonymous
:)
anonymous
  • anonymous
no, they say that t=1 means the first week
anonymous
  • anonymous
ahh gotcha
anonymous
  • anonymous
now when you find t , for example if you find t = 10 you know that it is the 10th week in year
anonymous
  • anonymous
now, you got the equation : n=84.59 + 24.8sin(pi*t/24)
anonymous
  • anonymous
and they ask you for what weeks n = 96,990
anonymous
  • anonymous
i got undefined ...
anonymous
  • anonymous
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
anonymous
  • anonymous
so it is really should be : 96.99 = 84.59 + 24.8sin(pi*t/24)
anonymous
  • anonymous
since they say "n is in thousands of items"
anonymous
  • anonymous
im getting a crazy calculation
anonymous
  • anonymous
http://mathway.com/answer.aspx?p=trig?p=96.99SMB15SMB01SMB1584.59SMB15+SMB1524.8sin(SMB19*tSMB1024)?p=1?p=?p=?p=?p=?p=0?p=?p=0?p=?p=?p=SolveSMB15theSMB15EquationSMB15forSMB15t
anonymous
  • anonymous
why, look: 96.99 = 84.59 + 24.8sin(pi*t/24) 12.4 = 24.8sin(pi*t/24) 0.5 = sin(pi*t/24)
anonymous
  • anonymous
week 4, week 20, and week 52?
anonymous
  • anonymous
wait ill check :)
anonymous
  • anonymous
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
anonymous
  • anonymous
yay ur being my life saver right now!!!
anonymous
  • anonymous
THANK U SOO MUCH
anonymous
  • anonymous
yw :))

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