$162.38. Multiply 150 by 0.0825. Add the number you get to 150
Answer:
its the 4th one . The one all the way to the bottom
Step-by-step explanation:
Answer:

Step-by-step explanation:
The exponential decrease formula that we must use is:

Where A is the amount of thorium as a function of time
is the initial amount and k is the decrease rate
We know that initially there are 50 gr and that you decay 50% every 1.9 years.
So


We solve the equation for k





After 22.8 years the amount of thorium that exists is:

