Answer:

Step-by-step explanation:
The angles of a triangle add to 180, add the angles and solve for x
X= all real numbers.
any value of x makes this equation true
Step-by-step explanation:
dont know if you know then plz coment me the answer
Answer:
x^2+8x+15
Step-by-step explanation:
This is g(f(x)), or g(x+4). x+4 squared is x^2+8x+16, and taking 1 away from that is x^2+8x+15.