Answer:
Step-by-step explanation:
9) In parallelogram, adjacent angles are supplementary
14x - 4 + 86 = 180
14x = 180 - 86 + 4
14x = 98
x = 98/14
x = 7
10) In parallelogram, opposite angles are congruent.
6x + 4 = 64
6x = 64 - 4
6x = 60
x = 60/6
x = 10
11) In parallelogram, opposite sides are congruent.
3x + 4 = 2x + 10
3x -2x + 4 = 10
x + 4 = 10
x = 10-4
x = 6
