The answer is 18, Hope you get it right!
Answer:
In the given two column proof two sides and included angles are equal.
Triangles are congruent if any pair of corresponding sides and their included angles are equal in both triangles .In the figure sides BD≅BD , AB≅ BC and <ABD ≅,BDD Therefore triangle ABD and triangle CBD are congruent by SAS property of congruence.
4. 2b-6+3b=
5b-6=143
5b=143+6
5b=149
b=149
------
5
