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 Sta

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Question 94311: 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 x 2 What will the population of the United States be in 2025 if this growth rate continues?
Answer by stanbon(75887) About Me  (Show Source):
You can put this solution on YOUR website!
Comment: You did not post the proper formula.
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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 x 2 What will the population of the United States be in 2025 if this growth rate continues?
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Formula: P(x) = 250*2^[(x-1990)/66]
Your Problem:
P(2025) = 250*2^[2025-1990)/66]
P(2025) = 250*2^(35/66)
P(2025) = 250*1.4442325...
P(2025) = 361.058129... million
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Cheers,
Stan H.