The U.S. population in 1990 was approximately 250 million, and the average growth rate for the past 30 years gives a doubling time for 66 years. The following formula for the U.S. then becomes
P (in millions)=250*2(y-1990)/166
what will the population of the U.S. be in 2025 if this growth rate continues?
2007-11-15 05:01:21 · 3 answers · asked by lele 2 in Education & Reference ➔ Homework Help
ok so just plug in 2025 for y.
2025-1990= 35
now multiply it by 2= 70
divide 70 by 166= ? (i don't have a calculator at the moment)
and multiply that answer by 250
does that work?
2007-11-15 05:18:11 · answer #1 · answered by Anonymous · 1⤊ 0⤋
If you have a graphing calculator like a TI-89 you can enter that equation as
y=250*2(x-1990)/166 and then just search for the y value on the year 2025. Using this setup will put your years on the x axis and your population on the y axis.
2007-11-15 13:32:25 · answer #2 · answered by kritter0101 2 · 0⤊ 0⤋
This isn't really a "word problem" because the equation you need is already given. Substitude "2025" for "y" in the given equation and solve for P.
2007-11-15 13:17:55 · answer #3 · answered by jgoulden 7 · 1⤊ 0⤋