SOLUTION: This problem has had me stumped for 2 days now. Can I please get help? The U.S. population in 1990 was approximately 250 million, and the average growth rate for the past 30 yea

Algebra ->  Polynomials-and-rational-expressions -> SOLUTION: This problem has had me stumped for 2 days now. Can I please get help? The U.S. population in 1990 was approximately 250 million, and the average growth rate for the past 30 yea      Log On


   

Question 88360: This problem has had me stumped for 2 days now. Can I please get help?
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 below 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?
Answer by ankor@dixie-net.com(22740) About Me  (Show Source):
You can put this solution on YOUR website!
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 below 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?
:
P = 250+%2A+2%5E%28%282025-1990%29%2F66%29
:
Using a calc find 2%5E%2835%2F66%29 = 1.4442325
:
P = 250 * 1.4442325
:
P = 351.0581 (in millions)