If 47-year-old matt can remember the poem he memorized in mrs. smith's 2nd grade class, matt is using what type of memory for this task?

The answer is "Episodic memory".

Episodic memory refer to the memory of occasions which is autobiographical like times, places, related feelings, and other relevant who, what, when, where, why learning, that can be expressly expressed or invoked. It is the gathering of past individual encounters that happened at a specific time and place.