Question 377617
x(at minimum)=-b/2a
=12/2=6 the number of tables to build for a minimum cost.
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x^2-12x+72
=6^2-12*6+72
=36-72+72
=36 minimum cost
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Ed
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{{{graph(500,500,-20,20,-100,100,x^2-12x+72)}}}