Mathematics, 15.01.2021 23:10, deedee363

In the 1900s, the life expectancy of a human in the United States was 50 years. The life expectancy of a human now is 78 years. What is the percentage change in the life expectancy of a human in the United States?

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In the 1900s, the life expectancy of a human in the United States was 50 years. The life expectancy...