Answer:
9 answer ok like floow on 
 
        
             
        
        
        
Well, it depends what shape you are using the volume formula for. If it's for a square (I'm assuming) then the volume formula would be:
Side^2 
        
             
        
        
        
Answer:
B) 10 m
Step-by-step explanation:
Area is 20 and Height is 4
Ok so 
AREA of a triangle is =1/2Base Times Height
work back
Area=20
Height=4
b=Base
20=1/2b*4
Simplify both sides of the equation.
20=2b
Flip equation
2b=20
Divide both sides by 2
b=10
Base=10 m