The answer to this question is c I just took the test
Answer:
105/35 = 3
Explanation:
This means that say the radioactivity was 100 then that would half 3 times. 100-50, 50-25, 25-12.5.
Extra information:
No matter what the half life is this number will never reach zero as it will continue to half, however it will become to small to eventually read
