I think it is 25 degrees F.
HOPE THIS HELPS
Because 25% is half of 0.5 and the half life of is given as 5,715, the time it takes to reach this amount should just be double the half life: 11430 years.
However, in other cases the problem may not have easy numbers, so below is a more mathematical approach.
The half life formula is .
Solving for t gives:
Given information:
Plug in given values and solve for t.
With correct significant figures, this would be 11000 years.
A mixture can be called as a solution when the mixture is homogeneous
Answer: About 43 billion tons
Explanation:
This is gonna be quite hard to explain.