The equation p 0018t2 213t 1556 gives the percentage of A

The equation p = -0.018t^2 + 2.13t - 15.56 gives the percentage of Americans who buy newspapers, where t is the age in years of the potential buyer, and P is the percentage of people that age who buy newspapers. What percentage of 25-year olds buy newspapers according to this model? Answer: _______ % (Round to the nearest tenth of a percentage.)

Solution

p = -0.018t^2 + 2.13t - 15.56

percentage of 25 year old

plug t = 25 and find p

p = -0.018(25)^2 + 2.13(25) - 15.56

p = -11.25 + 53.25 - 15.56

p = 26.44

therefore, 26.4 % of 25 year old buy newspapers