The number N of trees of a given species per acre is approximated by the model N = 2000 (10-0.12x), 3 ≤x≤ 30 where x is the average diameter of the trees (in inches) 4.5 feet above the ground. Use the model to approximate the average diameter (in inches) of the trees in a test plot when N = 23. (Round your answer to two decimal places.) x = in

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