Answer:
Angle B is 54º.
Step-by-step explanation:
First, find x. Since angle A and angle B are supplementary angles, they add up to 180º.
(7x + 7)º + (4x - 14)º = 180º.
11x - 7 = 180
11x = 187
x = 17.
Now, substitute 17 for x in angle B's equation, (4x - 14).
4(17) - 14
= 68 - 14
= 54º
