Hey there! :D
If m<A is the vertex, and it is isosceles, then the last two angles are equal.
All the angles in a triangle equal 180 degrees.
180-140= 40
40/2= 20
m<b=
20 degrees. I hope this helps!
~kaikers
1. x + 49 = -3x + 1
4x = -48
x = -12
2. 7x + 23 + 4x + 25 = 180
11x + 48 = 180
11x = 132
x = 12
