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anonymous

  • one year ago

A store had 175 cell phones in the month of January. Every month, 10% of the cell phones were sold and 10 new cell phones were stocked in the store. Which recursive function best represents the number of cell phones in the store f(n) after n months? f(n) = 175 - 0.9 • f(n - 1) + 10, f(0) = 175, n > 0 f(n) = 0.1 • f(n - 1) + 10, f(0) = 175, n > 0 f(n) = 175 + 0.9 • f(n - 1) + 10, f(0) = 175, n > 0 f(n) = 0.9 • f(n - 1) + 10, f(0) = 175, n > 0

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  1. anonymous
    • one year ago
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    @Thehulk49

  2. anonymous
    • one year ago
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    @phi

  3. phi
    • one year ago
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    10% of the cell phones were sold if you sell 10% of the phones, what percent do you have left ?

  4. anonymous
    • one year ago
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    90%?

  5. anonymous
    • one year ago
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    @phi

  6. phi
    • one year ago
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    yes, and you can write 90% as 0.9 (90% means 90/100)

  7. phi
    • one year ago
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    if you call the number of phones f(n) then you will have 0.9*f(n) then 10 new cell phones were stocked that means add 10: 0.9*f(n) + 10 that is the number of phones for the next month, i.e. for f(n+1) thus: f(n+1) = 0.9 f(n) + 10 of course, you need a starting number of phones at n=0 f(0)= # of phones you start with. 175 cell phones in the month of January so I would say f(0)= 175

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