c and e are expressions.
b is an equation.
a and d are inequalities.
Expressions are the only ones WITHOUT an 'equals', 'greater', or 'less than'.
( = , > ,. < )
Really hope this proves useful to you, any further questions please ask :)
Answer:
72 degrees
Step-by-step explanation:
Congruent supplements Theorem.
Answer to this problem is D