The tables below give the numbers of some species of threatened and endangered wildlife in the United States and in foreign countries in 2012.
United States

Foreign

(a) Write a matrix A that contains the number of each of these species in the United States in 2012 and a matrix B that contains the number of each of these species outside the United States in 2012.
(b) Find a matrix with the total number of these species. Assume that U.S. and foreign species are different.
(c) Find the matrix B - A. What do the negative entries in matrix B - A mean?

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Mammals Birds Reptiles Amphibians Fishes 15 9. 70 82 65 14 20 Endangered 78 13 14 Threatened