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    An equation with only the profit function??

    A company produces washer machines. The profit function (in thousands of dollars) is given by P(x)=-10x^2+100x-160=0 , 1 < or equal to (x) < or equal to 10, where )x) represents the number of items (in thousands) produced per month. (I) find the values of x for which the company has a profit...
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