I am sorry if i am wrong but i keep getting 6,4
They are essentially asking us to solve:

Solving this equation for x tells us that it will take around 80.1 years for the materials in the vault to reduce to 357 pounds.
Answer:
s=80
Step-by-step explanation:
5/8ths is .625
80 x .625 =50
Answer: John is most likely to win.
Step-by-step explanation: John is most likely to win because he can roll the following numbers:
2,6
3,5
4,4
5,3
6,2
Oh Neil Can only roll these numbers
5,6
6,5
So John would most Likely win
Answer:
$2.62
Step-by-step explanation:
The rate per thousand is ...
... (premium amount)/(number of thousands of face value)
... = $397.26/151.625 ≈ $2.62