For Tv advertising expenditures up to $20 million, this equation closely appoximates: What is / ax? 2. Originally Posted by nikki090909 For Tv advertising expenditures up to$20 million, this equation closely appoximates:
When you partially differentiate, you treat the variable you are not differentiating as a constant. (i.e. $\frac{\partial}{\partial x}(y)=0$)