the second one? Step-by-step explanation:
Answer: 
Step-by-step explanation:
We know that the general form of the exponential decay formula is
, where y is final amount remaining after t time, A is the original amount and r is the rate of decay
Now, the ratio of strontium-90 remaining, p , as a function of years, t , since the nuclear accident. 
Hence, the ratio of remaining since the nuclear accident is 
Answer:

Step-by-step explanation:
Given


Required

This is calculated as the number of women divided by the population of the class
i.e.

So, we have:


your answer would be A. I would hope this is right
Answer:because it works different when you smell a chemical sense from then if you smell a regular sese.
Step-by-step explanation:
A regula sense like a fart might smell bad. But a chemical sense can burn your nostrils and burn you nose hairs causing you not to have good sent or to never smell again