Given That $a = \langle 3 , - 2 \rangle , b = \langle 3,3 \rangle , \text { and } c = \langle - 2,2 \rangle$

Given that $a = \langle 3 , - 2 \rangle , b = \langle 3,3 \rangle , \text { and } c = \langle - 2,2 \rangle$ , find the number. $a \cdot ( b + c )$

A) 13
B) 10
C) -7
D) 25
E) 5