Final answer:
The EDD, or Estimated Due Date, can be calculated by adding 284 days to the first day of the last menstrual period (LMP). In this case, the EDD would be December 19, 2015.
Step-by-step explanation:
The EDD, or Estimated Due Date, is the date when a pregnant woman is expected to give birth. To calculate the EDD, obstetricians add 284 days (approximately 40.5 weeks) to the first day of the last menstrual period (LMP). In this case, if the LMP is March 12, 2015, adding 284 days would give an EDD of December 19, 2015.