英语翻译

问题描述:

英语翻译
cost is a function of the number of units produced as given by :C(n)=0.02n^2-42n+5000.how many units,n,produce a minimum cost

题目大概意思是,成本cost(c)与生产出的元件的个数成如公式所示的关系,问当n等于多少是得到的c值最小
这是一个求最小值题目.
专业回答,不懂再问,