Answer:
∠H = 120°
Step-by-step explanation:
In a parallelogram, adjacent angles are supplementary:
∠H +∠T = 180
(2x +60) + (x +30) = 180
3x = 90 . . . . . . . subtract 90, collect terms
x = 30 . . . . . . . . divide by the coefficient of x
Then the measure of angle H is ...
∠H = 2·30 +60 = 120 . . . . . degrees
