Posted by **Erika** on Friday, November 5, 2010 at 12:17am.

for population in billions, where t is years since 1990:

N(t) = 41/1+11 e^−0.1 t

(b) According to this model, when will the earth's population reach 20.5 billion?

During the year .

How about 40.9 billion?

During the year .

## Answer this Question

## Related Questions

- Applied Calculus - The world population at the beginning of 1990 was 5.3 billion...
- Math - he world population at the beginning of 1990 was 5.3 billion. Assume that...
- math - In 1980, the population of a certain country was about 161 000. since ...
- algebra - In 1990, the population of Africa was 643 million and by 2000 it had ...
- math - UGH! The human population of the world is over 6 billion. The increase of...
- human life - The human population of the world is over 6 billion. The increase ...
- Math - One model of Earth's population growth is , where t is measured in years ...
- Algebra 2 - According to the US Census Bureau, the population of the United ...
- math - P=347e^.023t, where t is the number of years after 1990. According to the...
- Math - The population of Winnemucca Nevada can be modeled by P=6191(1.04)^t ...

More Related Questions