15. Alicia wants to give two gifts to her best friend. One gift will be a necklace and one will be a shirt. There are four different shirts choices and seven necklace choices.
Part A: How many different gift combinations can Alicia give to her best friend? Part B: After giving one shirt and one necklace to her best friend, Alicia has three shirts and six necklaces left. How many gift combinations could Alicia give to another friend?