Answer:
B. 68°
Step-by-step explanation:
We know:
The sum of the measures of the angles of the triangle is equal to 180 °.
Therefore we have the equation:
[tex]y+(y-12)+56=180[/tex] combine like terms
[tex]2y+44=180[/tex] subtract 44 from both sides
[tex]2y=136[/tex] divide both sides by 2
[tex]y=68[/tex]
