Mathematics is a field of study that discovers and organizes methods, theories, and theorems that are developed and proved either in response to the needs of empirical sciences or the needs of mathematics itself.
Mathematics, the science of structure, order, and relation that has evolved from counting, measuring, and describing the shapes of objects. Mathematics has been an indispensable adjunct to the physical sciences and technology and has assumed a similar role in the life sciences.
Mathematics also publishes timely and thorough survey articles on current trends, new theoretical techniques, novel ideas and new mathematical tools in different branches of mathematics.
Comprehensive encyclopedia of mathematics with 13,000 detailed entries. Continually updated, extensively illustrated, and with interactive examples.
Technology is everywhere around us, and we need mathematics to master it! In fact most top-paying jobs need good math skills:
Mathematics is the science and study of quality, structure, space, and change. Mathematicians seek out patterns, formulate new conjectures, and establish truth by rigorous deduction from appropriately chosen axioms and definitions.
The word "on" fits better meaning "on the subject of question 1". The word "in" fits better meaning "occurring in question 1", or in its answer, if that is what is meant. The comments would be understood with either "on" or "in", though. Since you've invited rewording, these might work: For question 1, you repeated the example as a sentence.
prepositions - on question 1 or in question 1 - English Language ...
I have a question on the grade you awarded me. I have a question on metaphysics. I'm having real trouble figuring out why on doesn't work in your example sentence. D (related) has a wider meaning: it indicates questions that have something to do with the course. In particular, related includes questions about the subject matter of the course.