The table lists numbers of Walmart employees E in millions, x years after 1987. (a) Evaluate E(15)

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The table lists numbers of Walmart employees E in millions, x years after 1987.image



(a) Evaluate E(15) and interpret the result. 


(b) Find a quadratic function f that models these data. 


(c) Graph the data and quadratic function f in the same xy-plane. 


(d) Use  to estimate the year when the number of employees reached 3 million.

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