Answer:
Angle A= 30
Step-by-step explanation:
A triangle has to equal 180 degrees so the first thing you have to do is subtract 180-70. You get 110 so the other two angles in the triangle have to equal 110.
Now you can solve the expression x+40+x+90=110
First combine like terms 2x+130=110
Then subtract 130 from both sides 2x=-20
Then divide by 2 x=-10
Then solve for a -10+40=30
So angle A = 30
