<PRE><B>Question 70041</B>
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^(y-1990/66)
:
What will the population of the United States be in 2025 if this growth rate continues?
Replace y with 2025 in the above equation
:
P (in millions) = 250 x 2^(2025-1990/66)
:
P (in millions) = 250 x 2^(35/66)
:
P (in millions) = 250 x 2^.53
:
P (in millions) = 250 x 1.443929
:
P (in millions) = 360.98</PRE>