Answer:
Irrational numbers can look like fractions: 

Irrational numbers have never ending decimals. Pi and e are also irrational numbers.
Answer:
3+x sqrt 7 -13 is a radical equation.
Answer:
A. y=3x+6
Step-by-step explanation:
1. x=y/3 -2
2.x+2= y/3
3. 3(x+2)=y
Final Answer: y=3x+6
Depending on how big the center is, I would say 15.
I hope this helped!