Answer: D. 40 degrees (I'm assuming you meant 40 not 400)
Step-by-step explanation:
There are 180 degrees in a triangle so we list the angles in an equation:
180 = 50 + 2y + y + 10
Subtract 60 from each side of the equation:
120 = 3y
Divide 3 from each side of the equation:
40 = y
