Posted by **carry** on Saturday, April 21, 2007 at 9:05am.

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 times 2( y-1990)/66

What will the population of the United States be in 2025 if this

growth rate continues?

Did I do this correct

P=250*2^(2025-1990)/66

p=250*2^35/66

p=250*2^.53

p=250*1.444

p=361 million

is this correct if not please explain what i did wrong

i don't think that it is (2^),isn't it suppose to be times by two?

so,

P=250*(2*(2025-1990)/66)

P=250*(2*(35/66))

P=250*1.06

P=?

and you have your final answer here! =)

carry, you are right.

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