9514 1404 393
Answer:
x = 10
Step-by-step explanation:
In a parallelogram, adjacent angles are supplementary.
(9x +15) +(6x +15) = 180
15x +30 = 180 . . . . . . . . . . simplify
15x = 150 . . . . . . . . . subtract 30
x = 10 . . . . . . . . divide by 15
