Answer:

Step-by-step explanation:
The time constant of the isotope is:


The decay of the isotope is described by the following model:

Now, the time is cleared in the equation:



Answer:
b
Step-by-step explanation:
Answer:
B
Step-by-step explanation:
12 is 1/4 of 48 so when you take $12 off $48 you take 1/4 of 25% away
Answer:
-1
Step-by-step explanation:
graph