Answer:
m<NMO = 76 deg
Step-by-step explanation:
If a triangle has two congruent sides, then the angles opposite those two congruent sides are congruent.
Since sides NO and NM are congruent, then angles NMO and NOM are congruent.
Angles NOP and NOM are supplementary, so their measures add up to 180 deg.
m<NOM + m<NOP = 180
m<NOM + 104 = 180
m<NOM = 76
m<NMO = m<NOM = 76
m<NMO = 76 deg
