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?

Guest Jan 30, 2019

#1**+1 **

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?

ElectricPavlov Jan 30, 2019

edited by
Guest
Jan 30, 2019

#2**+1 **

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

ElectricPavlov Jan 30, 2019