For the sixth question, I got:
Whenever I use the answer I got, it says it's incorrect, but every time I do it I get that answer.
I had said:
These answers check out perfectly in the three equations.
If there are objections, they should be directed to the problem itself.
Either there are typos in the original statement
. . or the problem was deliberately created to cause confusion.
If  is true, then  cannot be true.
Also,  has no solution in real numbers.
The system is inconsistent and has complex roots.
. . There are no correct answers.
I also agree with your work, I just don't get how we're supposed to answer this question as they are asking for a number (answers are submitted online.) I inputted -3/8 and it said I had the wrong answer.
I've emailed my professor asking about this question.
Thanks for all the help, I'll post back once I have a response from my professor.