The following table gives the years of life expectancy at birth for Blacks and Whites born in the United States in selected years from 2000 and projected to 2020.

(a) Make a matrix A containing the information for Whites and a matrix B for Blacks.
(b) Use these to find how many more years Whites in each category are expected to live than Blacks.
(c) For which of these birth years is the life expectancy difference greatest?

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Blacks Whites Males Females Males Females 74.7 74.7 76.5 77.2 78.2 79.2 2000 2006 2010 2015 2020 67.8 69.7 70.2 79.9 80.6 81.3 81.8 75.7 76.5 77.1 77.7 72.6 82.4