Where should I ask the question cited above, how and why is it vague and unclear what I am asking?
Here's one reason why the [original, unedited] question is vague. One of the most useful mathematical topics for economics is multivariable calculus, eg when finding the optimum of a function containing separate variables for the quantities of each of a number of goods. Does that count as an advanced topic? Perhaps not. On the other hand, it's probably a bit beyond the introductory calculus some students learn at high school.