Answer: D. Arabella. She has a 0.79 probability of brushing both times.
Step-by-step explanation:
A.P.E.X
Using shells, the volume is

where

is the distance from any point in the region along the x-axis to the axis of revolution

, which makes up the radius of each shell; and

is the height of each shell, which is determined by the line

.
So the volume is
Rectangle on the left = 3 × 4 = 12
Rectangle in the middle = 3 × 2 = 6
Rectangle on the right = 4 × 3 = 12
Add:
12 + 6 + 12 = 30
Answer = 30
Hope this helped☺☺