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Advertising revenue for newspapers in the United States for the years 1985 through 1999 is
approximated by the model where R is revenue in billions of
dollars and t represents the year with

2 R = −1.03 + 7.11t − 0.38t
t = 5 corresponding to the year 1985. In what year will

revenue be maximum?

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 Jan 30, 2019
 #1
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Is this part of your equation written correctly?      I think one of these terms should be t^2 ??? 

  7.11t − 0.38t <<<<<<<<-------- probably this one?

 Jan 30, 2019
edited by Guest  Jan 30, 2019
 #2
avatar+18754 
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2 R = −1.03 + 7.11t − 0.38t^2

 

Max will be at  - b/2a    =    - 7.11/(2*(-.38)) = 9.355 yrs       since 1985  is t 5        1989 will be the year

 Jan 30, 2019

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