Answer: -3/2
Step-by-step explanation:
The axis of symmetry, and thus the x-coordinate of the vertex, is given by 
So, the answer is 
Answer:
X=9
Step-by-step explanation:
12+15=27
18+x=27
27-18=9
X=9
Answer:
-4
Step-by-step explanation:
Let's put this in math notation. We can call the number x:
9x+4=8x
Subtract 8x from both sides:
x+4=0
Subtract 4 from both sides:
x=-4
Answer:
No
Step-by-step explanation:

therefore it doesn't coenide with pythagorian theorem