The opening value of a stock index on the first day of trading from 1994 to 2010 can be modeled using the following polynomial: N(t)=11.8690t^3+20.3119t^2+22.0273t+757.2156N(t)=11.8690t3+20.3119t2+22.0273t+757.2156 where tt is time in years since 1994. What is the y-intercept and what does this tell you in practical terms? I think that the answer is: The y-intercept is 757.22, which tells me that is what the opening value of a stock index on the first day of trading.    What does this model tell you is the opening value of the stock index on the first day of trading in 2004? (15,108 is the actual number for that year).

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