nicolasjarrin
25.10.2020 •
Mathematics
28. UNITED STATES POPULATION
a. In 1990 there were about 250,000,000 people living in the United States. By the year
2000 that number had increased by 10.4%. How many people were living in the
United States in 2000?
b. Suppose we assume that from 2000 to 2010 the population will increase by 10.4%
again, will there be more than 3 billion people living in the United States by 2010?
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Ответ:
a. 276,000,000 people
b. No.
304,704,000 people
Ответ:
x + y = 25
x - y = 7
2x = 32
x = 16
y = 25 - 16 = 9