Question
The polynomial $C(x)=6 x^2+90 x$ gives the cost, in dollars, of producing a rectangular container whose top and bottom are squares with side $x$ feet and height 6 feet. Find the cost of producing a box with $x=4$ feet.
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The polynomial $C(x)=6 x^{2}+90 x$ gives the cost, in dollars, of producing a rectangular container whose top and bottom are squares with side $x$ feet and height 4 feet. Find the cost of producing a box with $x=6$ feet.
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