Answer:
x = 39
Step-by-step explanation:
all triangles have angle measures that add up to 180°.
This means that to find what x is, you add 102 and 39, and then subtract that from 180, so
180-(102+39) = x
180-141=x
39=x
The polygon would have 18 sides. Hope this helps!
Answer:
y=x^2-5x+4 i am not sure but a im try
