Please read the instruction carefully
The midterm essay is a 3-5 page (single-spaced) article on a topic in business and how Calculus is applied within it. The mathematical topics in the article should be differentiation or integration, but it need not be both. The article should read like a technical report. What this means is that it should have a very short one-paragraph introduction and its conclusion should report the technical consequences of the work. You are welcome to use diagrams and graphs to demonstrate your points.
Have a look at https://sites.math.washington.edu/~morrow/336_10/papers/andrew.pdf
This is one use of Calculus, with asset pricing in business, might be help.