The table below represents the cost in hundreds of thousands of dollars for operating a factory for X hours the data is modeled by the function. f(x)=4/3x^3-15/2x^2+355/6x+57. Approximately how many hours of operation will result any cost of $310000

fist on the left goes with the third on the right. second on the left goes with the fourth on the right. third on the left goes with the second on the right. the fourth on the left goes with first on the right

if im not mistaking its

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