Answer:
39 degrees
Step-by-step explanation:
If EFG is a right angle, then it is 90 degrees. EFG is made up of angles x+12 degrees and x, so you can write as an equation: x + 12 + x = 90
solve from there:
x + 12 + x = 90
2x + 12 = 90
2x = 90 - 12
2x = 78
x = 78 / 2
x = 39
