Posted by kennisha on .
the population of Canadian city is modeled by P(t)= 12t^2 + 800t + 40,00, where t is the time in years. when t=0, the year is 2007
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,
so 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 
Seince 
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