Answer:
121°
Explanation:
Since we are working with a parallelogram, A and C will have the same angle measure and B and D will as well. We can form an equation and solve for x.
9x - 5 = 10x - 19
~Add 5 to both sides
9x = 10x - 14
~Subtract 10x to both sides
-x = -14
~Divide -1 to both sides
x = 14
Find angle B with what we found for x.
9x - 5
9(14) - 5
126 - 5
121
Best of Luck!