Your answer is n=2. thank me if this helped you. :)
It would be neither because 5 to be patrol would be -5 and to be perp it would be -1/5 there’s is no way to get 9 to 5
The area formula for a triangle is 1/2 (base * height)
12/3 or the same thing as ur question but just add a division sign, eg. difference of two and one that would be 2-1