M = (1,4)
N = (5,2)
For M, you simply move to 1 on the x axis abs for 4 you move on the y axis. Same does for N, for 5 you move on the x axis and for 2 you move on the y axis.
It would be: -2/3 * -9/10 = 18/30 = 3/5
So, option B is your answer.
Hope this helps!
It the talk empty side it will be 8 and the line will be 4 tell me if I am wrong
Your answer will be:
The total number of marbles that are not black.
