The average cost function is given by $C = 0.04x^2 - 5.92x + 600$.
This is a quadratic function in the form $C(x) = ax^2 + bx + c$, where $a = 0.04$, $b = -5.92$, and $c = 600$.
Since $a = 0.04 > 0$, the parabola opens upwards, which means the function has a
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