Answer:
45.5
Step-by-step explanation:
Angles B and C are equal because it is an isosceles triangle.
This means that 180 = (2x+4) + 2(3x+5)
Then just solve for x
180 = 2x+4+6x+10
180 = 8x+14
166 = 8x
x = 20.75
Now plug this into a
A = 2(20.75)+4
A = 45.5
You can check this buy plugging it into B
3(20.75)+5
B = 67.25
C = B, so C = 67.25
B + C + A = 180
67.25 + 67.25 + 45.5 = 180
134.5+45.5 = 180
180 = 180
