<PRE><B>Question 83849</B>
In 1975 the population of the Earth was approximately 4 billion and doubling every
35 years. The formula for the population P in year Y for this doubling rate is
P(y)  = 4* 2^[( y-1975)/35](in billions)

QUESTION
82. Social science. What will the population of the United States be in 2025 if this growth rate continues?

P(2025) = 4*2^[(2025-1975)/35]
P(2025) = 4*2^(50/35)
P(2025) = 4*2.6918 = 10.767... Billion
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Cheers,
Stan H.
</PRE>