Suppose that the cost of manufacturing x items is approximated by C(x)=625 + 15x +0.01x^2, for 1 < or equal to x < or equal to 500. The unit cost would then be U(x) = C(x)/x. How many items should be manufactured in order to ensure that the unit cost is minimized..... I DONT KNOW WHAT TO DO..... I started off by doing the derivative of the first equation, which was a guess but then what I do?