5) -4+(-3) = -7 because you got -4 and then 3 more negatives so you got 7 negatives
6) -3+2= -1 because you got -3 and then 2 positives , now you have only one negative left
7)5+(-3) = 2 because you have 5 pozitives and then 3 negatives happen, now you got only 2 positives remaining...and so on
<span>If all your entries are integers, the determinant is also an integer.
</span>For this problem, 1 0
0 13
For this question, you should just fix 3 values and make the 4th value an unknown and solve it.
I hope my answer helped you somehow.