Question

What is the value of x?
61
37
85
122

Answer 1

2x+24=145, 2x=121, x=60.5;
I would say x=61.

Ok basically when you have two angles opposed like that by common summit, they are equal. just set them equal and solve for x.

Answer 2

Look up the definition of vertical angles

Answer 3

Or even better, look up a proof of the theorem that vertical angles are congruent.