Answer: b=46
Step-by-step explanation:
b+33 = b-13 + b the exterior angle is the sum of two interior angles.
so they have to equal each and solve for b
b+33=b -13 + b
b +33 = 2b -13
+ 13 +13
b+ 46 = 2b
-b -b
46 = 1b
b=46
