Cheese Production The total amount of cheese, in billions of pounds, produ...

Cheese Production The total amount of cheese, in billions of pounds, produced in the 13 western and 12 north central U.S. states in 1999 and 2000 was as follows:

Thinking of this table as a (labeled) 2 × 2 matrix P, compute the matrix product [−1 1]P. What does this product represent?