Sunday

April 20, 2014

April 20, 2014

Posted by **kennisha** on Sunday, April 22, 2012 at 7:33pm.

A) according to the model, what will the population be in 2020?

B)in what year is the population predicted to be 300,000?

- math -
**Reiny**, Sunday, April 22, 2012 at 9:01pmso for 2020 , t = 13

P(13) = 12(13)^2 + 800(13) + 40000

= .....

for the population to be 300 000

300000=12t^2 + 800t + 40000

12t^2 + 800t - -260000=0

3t^2 + 200t - 65000=0

let's use the formula

t = (-200 ± √820000)/6

= 117.6 years or a negative

totally unrealistic answer, but mathematically correct

the year would be 2007+117.6 = appr 2125

**Related Questions**

algebra 1 - the population of a city can be modeled using the equation p=40,000x...

math - The population of a Canadian city is modelled by P(t)=12t^2+800t+40000, ...

Math - A city of 2,950,000 people has a 2.5% annual decrease in population. ...

Math - The population of a southern city follows the exponential law. If the ...

math - suppose the growth of a population in millions is modeled by 3.2*(1.72)^t...

Math, rates - Which rates are equivalent? 6 U.S. dollars = 18 U.S. dollars 8 ...

algebra - the population of a city is expected to triple every 25 years . when ...

algebra - I have no clue where to begin on this problem. Can some one help me ...

algebra - Katydid population is modeled by N(t) = 50 / 1+9e^ -.33t where t is ...

math - the population of Concord in 1980 was 400 greater than half the ...