1. A property a parallelogram must have is that adjacent angles must be supplementary, they add up to 180º. We are given the values of the adjacent angles U and T. Their sum must add up to 180º. Solve for x. U + T = 180 5x + 2x - 9 = 180 7x - 9 = 180 7x = 189 x = 27 Substitute this value of x for itself in angle T. T = 2(27) - 9 T = 54 - 9 T = 45, (D) is the answer
