Answer:
x=30
Step-by-step explanation:
The sum of interior angles in a triangle will always equal 180 degrees. Knowing this, we can set the following equation:
2x+x+90=180
3x+90=180
Subtract both sides by 90
3x+90-90=180-90
3x=90
Divide both sides by 3
3x/3=90/3
x=30
I hope this helps!
