Answer:

Step-by-step explanation:
We have been given that Radium-226, a common isotope of radium, has a half-life of 1,620 years.
We will use half life formula to solve our given problem.
, where,
,
,
.
As we are told that the sample has 120 grams, this means that a equals 120. Upon substituting our given values in half life formula we will get,

Therefore, the equation
represents the remaining amount of Radium-226 after t years.
Idk what language ur speaking but umm if ur asking me to multiply fractions than its 8/9 and Idk what the 240 is for.
Answer:
it would be at least 8000 I'm pretty sure.
5/6 converged into minutes would be 50 minutes. You can figure this out by dividing an hour (60 minutes) by 6 which is 10. Then you multiply 10 by 5 to get a final answer of 50 minutes.
I hope this helped! :-)