Letters of recommendation

Hello. I am applying to be an engineer, but I have no recommendations from a math teacher. I have one from my AP US history teacher, and one from my AP Seminar teacher. My AP Seminar teacher is also doing a science research project with me, and she taught AP Seminar from a science-based lens.

Should I try to get a math recommendation? I don’t have good relationships with any of my math teachers.

Would my AP Seminar rec be considered as a recommendation from a “core teacher”? Would it count as a science rec or no because the class isn’t hard science? For schools that require two “core” teacher recommendations would history and seminar not be good enough?

Thanks