Endangered speciesThe tables on the next page give the numbers of some species of threatened and…

Endangered species

The tables on the next page give the numbers of some species of threatened and endangered wildlife in the United States and in foreign countries in 2007.

United States

Mammals Birds Reptiles Amphibians Fishes

endangered

69

75

13

13

74

threatened

12

14

24

10

65

Foreign

Mammals Birds Reptiles Amphibians Fishes

endangered

256

176

65

8

11

threatened

20

6

16

1

1

(a) Write a matrix A that contains the number of each of these species in the United States in 2007 and a matrix B that contains the number of each of these species outside the United States in 2007.

(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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