Answer:
12
Step-by-step explanation:
It has been going down by 6 because 24-6=18 and 18-6=12.
Either 75 or 105 would be my answer
To find the sum:

Therefore the answer is a^3+12a^2+14a+5.
Hope it helps!
The sample space is {(1,H), (1,T), (2,H), (2,T), (3,H), (3,T), (4,H), (4,T), (5,H), (5,T), (6,H), (6,T)}
On the number cube, she could roll any of the numbers from 1 to 6. On the coin, she could flip heads or tails.