Question: The function given by the formula f(x) = 0.000478x 2 - 1.813x + 1720.1 models world population in billions from 1950 to 2020 during year

The function given by the formula f(x) = 0.000478x2 - 1.813x + 1720.1 models world population in billions from 1950 to 2020 during year x. 

(a) Evaluate f(1985) and interpret the result. 

(b) Estimate world population during the year 2000. 

(c) According to this model, when did world population reach 7 billion?

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