You need to post the diagram that goes to this question. But here's a hint so you can do this on your own co planar means that the points are in the same plane and collinear means that the points are on the same line.
N is an number you make up or your teacher so we need to know what n equals
I have no idea on D. Sorry. I hope this helps. They may not be right I didn’t quite understand the directions.
Answer:
A=12
B=54
C=18
Step-by-step explanation:
A=first
B=second
C=third
A+B+C=84
B=3C
A=C-6
C-6+3C+C=84
5C-6=84
5C=90
C=18
A=C-6
=(18)-6
=12
B=3C
=3(18)
=54
X = 112
Sorry I had to smoosh the image so it would fit.
