Answer:
It's b, 45 degrees
Step-by-step explanation:
1) 180-90 = 90
20 90 divided by 2 = 45
45 degrees
There are 180 degrees in a triangle, so
x + y + 90 = 180.
But x = y so we can write 2x + 90 = 180.
2x = 180 - 90
2x = 90
x = 45
