SOLUTION: The U.S. population in 1990 was approximately 250 million, and the average growth rate for the past 30 years gives a doubling time of 66 years. The above formula for the United S

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Question 95396This question is from textbook
: The U.S. population in 1990 was approximately 250 million, and the average growth
rate for the past 30 years gives a doubling time of 66 years. The above formula for the
United States then becomes
P (in millions) = 250 * 2( y-1990)/66
What will the population of the United States be in 2025 if this
growth rate continues?
I put in 2025-1990/66 and I get .530
I am clueless on how to simplify or solve after that.
 This question is from textbook

Answer by stanbon(75887) About Me  (Show Source):
You can put this solution on YOUR website!
P (year) = 250 * 2^[( year-1990)/66] in millions
What will the population of the United States be in 2025 if this
growth rate continues?
P(2025) = 250*2^[(2025-1990)/66] million
P(2025) = 250*2^(0.5303...)
P(2025) = 250*1.44423...
P(2025) = 361.0581292... million
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Cheers,
Stan H.