i think that -5 will be the answer
I believe the answer is the first one you listed,
Hope this helps..
Answer : In radioactive decay, the half-life is the length of time after which there is a 50% chance that an atom will have undergone nuclear decay. It varies depending on the atom type and isotope, and is usually determined experimentally.
hope it will help you
Answer:
Am I supposed to tell you if it's right or wrong? or what...??
Explanation:
Could you add the picture please?
