Answer:
Step-by-step explanation:
A) 3x
The total of all the volumes is ...
(x -1) + (x) + (x +1) = (1+1+1)x +(-1+1) = 3x+0 = 3x . . . . . matches choice A
4th quadrant is the red point..
90% = 0.9
0.9 * 0.4
= 0.36
