



 
Hi Jess, If t = 0 is 2007 then t = 1 is 2008, t = 2 is 2009 and t = 3 is 2010. Thus in your expression
substitute t = 3 to obtain the population that the model predicts for 2010. For part b) you want t when 12t^{2} + 800t + 40,000 = 300,000. You will need to use the quadratic formula to solve for t. Penny  


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