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 formula is P(in millions)=250 *

Question 108319: 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 formula is P(in millions)=250 * 2 (y-1990/66)
What will the population of the united states be in 2025 if this growth continues?
Please help I have no idea how to get this started.
Found 2 solutions by stanbon, MathLover1:
Answer by stanbon(75887) (Show Source): You can put this solution on YOUR website!
P(year) = 250 * 2^(y-1990/66) ; Population is millions.
What will the population of the united states be in 2025 if this growth continues?
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P(2025) = 250*2^[(2025-1990/66]
P(2025) = 250*2^[35/66]
P(2025) = 250*1.44423...
P(2025) = 361.058 millions
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Cheers,
Stan H.
Answer by MathLover1(20849) (Show Source): You can put this solution on YOUR website!
The U.S. population in was approximately , and the average growth rate for the past years gives a doubling time of years. The formula is:

What will the population of the United States be in if this growth rate continues?

�.divide and by

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