9514 1404 393
Answer:
53°
Step-by-step explanation:
The sum of an angle and its supplement is 180°. Angle Z is (2T+21). Then the sum of angle T and angle Z is ...
T + (2T +21) = 180
3T +21 = 180 . . . . simplify
T +7 = 60 . . . . . . divide by 3
T = 53 . . . . . . . . subtract 7
The measure of angle T is 53°.
