Answer:
The answer is C.
Explanation:
Given that total angles in a triangle is 180°. In order to find the value of y, you have to add up all the angles in terms of y and make it equals to 180°:
[tex]y + y - 12 + 56 = 180[/tex]
[tex]2y + 44 = 180[/tex]
[tex]2y = 180 - 44[/tex]
[tex]2y = 136[/tex]
[tex]y = 136 \div 2[/tex]
[tex]y = 68[/tex]
