The per capita consumption of breakfast cereal in the US has the following model that appears above
C( t ) = $\displaystyle -{0.0032}{t}^{{3}}+{0.095}{t}^{{2}}-{0.344}{t}+{12.5}$ pounds, where t is the number of years since 1990.
Decide whether the rate of consumption was changing more rapidly in 2005 or 2009.
$\displaystyle {C}'{\left({15}\right)}$ = Preview Question 6 Part 1 of 3   lbs/year
$\displaystyle {C}'{\left({19}\right)}$ = Preview Question 6 Part 2 of 3   lbs/year
The rate was changing more rapidly in 20052009.