Answer: C :79.5
Step-by-step explanation: 
Since both triangles are congruent the angles are also congruent. P the measure we are trying to find is congruent to M since they’re equal it should look like this 
5x-19 = 3x+20.4 
5x = 3x+ 39.4
2x = 39.4
X= 19.7 
to find the measure of angle P plug in X to its equation so 
3x + 20.4
3 (19.7) + 20.4 
= 79.5