Project

So for math our teacher gave us a huge project over the weekend. We have to do a project on a famous mathematician. We have to make a poster about him and write a short 2-3 paragraph essay. It seems easy but I am stuck on this question I must include in the essay. By the way I am doing Isaac Newton he was like famous for Math, Science and everything.

What mathematics did your mathematician excel at and what effect did it have in their life or career?

I am having trouble answering this question because I don't get what it's trying to ask me. Please help I need it turned in by Monday.