2x -7=13 is an equation because it has an equal sign.
Answer:

Step-by-step explanation:
Concept Used: Percentage: 

Answer:
you know you can ask the question online right...
Step-by-step explanation:
To find V(6), we must plug in the number 6 for r in the equation.
<span>V(r)=9*pi*r^2
V(6) = 9*pi*(6)^2
= 9*pi*36 = 324*pi or </span><span>1017.88</span>
THE ANSWER TO THIS IS 3x-48