you have 84,000 grams of a radioactive kind of tellurium. how much will be left after 75 minutes if its half…

Explanation:

Step1: Calculate number of half - lives

The number of half - lives $n=\frac{75}{25}=3$.

Step2: Use half - life formula

The formula for radioactive decay is $A = A_0\times(\frac{1}{2})^n$, where $A_0$ is the initial amount and $n$ is the number of half - lives. Here, $A_0 = 84000$ grams and $n = 3$. So $A=84000\times(\frac{1}{2})^3$.

Step3: Calculate the remaining amount

$A = 84000\times\frac{1}{8}=10500$ grams.

Answer:

10500