英语翻译The total daily cost c,in dollars,of producing x units of a certain product is given by the function c(x)=k/5,where k is a constant (4x+1200)/x.If 20 units were produced yesterday for a total cost of $640,what is the value of 答案是50,

Question

英语翻译
The total daily cost c,in dollars,of producing x units of a certain product is given by the function c(x)=k/5,
where k is a constant (4x+1200)/x.If 20 units were produced yesterday for a total cost of $640,what is the value of
答案是50,求翻译及解题过程

Answer 1

额,我也觉得where```那句话不太通··是常数为什么还有变量x影响呢?应该就是640*5=3200吧,不知道答案是不是这样的,SAT数学有时候就是这样不用想太多的吧····