A company owns two retail stores. The annual sales (in thousands of dollars) of the stores each year from 2009 through 2015 can be approximated by the models S1 = 975 + 1.7t2
and
S2 = 344 + 72.1t
where t is the year, with
t = 9
corresponding to 2009.
(a) Write a function T that represents the total annual sales of the two stores.