Respuesta :

angle T = x

angle Z = 2x + 21

We know that supplementary angles add up to 180 degrees.

180 = x + 2x + 21

Combine like terms.

180 = 3x + 21

Subtract 21 from both sides.

159 = 3x

Divide both sides by 3

53 = x

angle T = 53 degrees