Just got this question.

is it ok to submit all answers for 9/7 hw in one .py file organized with comments?

Example given-

#What is the Markov property?

(answer here)

#Do exercises 3.1 and 3.4

(answer here)

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Submitting it all in one file is fine. But since none of the questions ask for Python programs, why use a .py file?  Better to use a .docx file so that you can make the result easier to read.