Hindu College, University of Delhi

Yes, you can apply. the eligibility criteria of B.Com(Hons.) of Hindu College (Delhi University) is given below.
Eligibility criteria :
1. An aggregate of 60% or more in English/Hindi and combination of three best among the following subjects: Mathematics, Accountancy, Economics and Business Studies/ Commerce.
2. Additional eligibility criteria : 50% or more marks in Mathematics/Business Mathematics.

Yes, you can apply. All other graduate (Science/commerce/Engineering etc.) with 60% marks in the last
qualifying examination or equivalent grade from the University of Delhi or any other Universities recognized as equivalent to University of Delhi are eligible for M.A. Political Science course. The admission will be based on an Entrance test.

Yes, you need maths in class 12th for BA economic Honors in DU. Non-maths students can not apply for this program in DU.
I hope, it will help.
Good luck.

Yes, you can apply for DU admission 2019 in B. Com under a regular/general category. But getting admission in DU colleges with 75% under Regular/General category can be a little difficult as the least cut off that most colleges accept is only till 84%.