Answer:
The current amount of the Potassium-40 sample is approximately 37.521 grams.
Explanation:
The amount of the sample of the radioactive isotope decays exponentially in time, the amount of mass of the sample as a function of time (
), in grams, is described below:
(1)
Where:
- Initial mass, in grams.
- Time, in years.
- Time constant, in years.
The time constant can be found from half life (
), in years, described in statement:
(2)
If we know that 
, 
and 
, then the current amount of the sample is:
The current amount of the Potassium-40 sample is approximately 37.521 grams.
Answer:
d. earths rotation on its axis
Answer:
In most states, state offices include: Governor, Lieutenant Governor, Secretary of State, and Attorney General, State Supreme Court Justices, Comptroller, Treasurer, State Senators, and State Legislators. These officials are elected by the voters of the districts they serve.
The Nile river is the longest river in the world, followed by the Amazon river which is the second longest.
