The gross national product (gnp) of a certain country was n(t)= (t)^2+5t+106 billion dollars, t years after 2000. at what rate was gnp changing with respect to time in 2008?

1)you must DERIVE THE FUNCTION t^2 + 5t +106, it represents the variation ,  dy/dt = 2t+5

now , substitute it value in the equation

N(8) = 2(8)+5 = 21

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