Radioactive element A decays to the stable element B with a half-life T. Starting with a sample of pure A and no B, which graph below correctly shows the number of A atoms, NA, as a function of time t? 
Definitions:
Common Law Marriage
A marriage recognized legally, despite there being no formal ceremony, based on the couple living together and presenting themselves as married for a significant period.
Open Marriage
is a form of marriage in which the partners agree that each may engage in relationships with other people, outside their marriage, sexually and/or emotionally.
Menopause
The natural biological process marking the end of a woman's reproductive years, characterized by the cessation of menstrual periods.
Menstrual Irregularities
Variations in the menstrual cycle’s timing, flow, or symptoms that differ from the norm, which can involve heavy bleeding, missed periods, or unpredictable timing.
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