Annual net sales, in billion of dollars, for the Hershey Company, the largest US producer of chocolate, is a function S = f(t) of time, t, in years since 2010.
(a) Interpret the statements f(5) = 7.39 and f¨(5) = −0.03 in terms of Hershey sales.
(b) Estimate f(8) and interpret it in terms of Hershey sales.