Im completely clueless on how to even start this .. I'm trying to help my little brother but i havent done this in over 10years and can't remember.. If anyone would be so kind to help me i would appreciate it thank you...

Answer:
Explanation:28-sides mp=pl (given)
angle M = angle L(given)
PN=NP(common side )
therefore triangle MPN is congruent to triangle LPN