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After an advertising campaign, the sales of a product often increase and then decrease. Suppose that t days after the end of the advertising the daily sales are, f(t) = - 6t^2 + 64t + 105 units. a) What is the average rate of growth in sales during the fourth day that is from time t = 3 to t = 4. b) In what instantaneous rate are the sales changing when t=3?

  • 2 years ago
  • 2 years ago

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  1. S Group Title
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    For a do you take a derivative and then plug in 3 and 4 and find the difference or what ?

    • 2 years ago
  2. Chlorophyll Group Title
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    a) Avg = [ f (4) - f(3) ] / ( 4 -3) = f (4) - f(3)

    • 2 years ago
  3. S Group Title
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    MMmm ok.. so just a difference with no derivative. Ok thanks! What about b?

    • 2 years ago
  4. Chlorophyll Group Title
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    b) instant rate = f' (3)

    • 2 years ago
  5. S Group Title
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    Ok got it! Thank you!

    • 2 years ago
  6. Chlorophyll Group Title
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    Thanks for helping me to make it so simple ;)

    • 2 years ago
  7. S Group Title
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    No problem.. hehe =D

    • 2 years ago
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