From 1999 to 2009, the number of dogs [tex]D[/tex] and the number of cats [tex]C[/tex] (in hundreds) adopted from animal shelters in the United States are modeled by the equations [tex]D = 2n+3[/tex] and [tex]C = n +4[/tex], where [tex]n[/tex] is the number of years since 1999.

a. Write a function that models the total number [tex]T[/tex] of adopted dogs and cats in hundreds for that time period.

b. If this trend continues, how many dogs and cats will be adopted in 2013?