A women's clothing chain takes inventory of one brand of sweater. The sweaters come in 3 sizes: small, medium, and large, and 5 colors. The inventories at stores A, B, and C are represented by the matrices below. 
A = 
; B = 
; C = 
Use the matrix operations on a graphing calculator to show that A + (B + C) = (A + B) + C.
What will be an ideal response?
A + (B + C) = A + 
= 
(A + B) + C = 
+ C = 
Mathematics
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