In order for the triangle to be isosceles, we have to set two lengths of the triangle equal to each other. 
Let's take the lengths 5x-12 and x+20 and set them equal to each other. 
5x - 12 = x + 20 
Combine like terms by moving them over to their respective sides.
Subtract x from both sides of the equation. 
4x - 12 = 20 
Add 12 to both sides of the equation. 
4x = 32 
Divide both sides by 4. 
x = 8 
Check your answer by substituting. 
5x - 12 = x + 20
5(8) - 12 = 8 + 20
40 - 12 = 28 
28 = 28
Solution: x = 8 
        
             
        
        
        
Answer:
166.5 m³
Step-by-step explanation:
Vcone = ⅓ × pi × r² × h
pi × r² × h = 3 × Vcone
Vcylinder = pi × r² × h
Vcylinder = 3 × Vcone
Vcylinder = 3 × 55.5 = 166.5 m³
 
        
                    
             
        
        
        
Answer:
The answer is 3
Step-by-step explanation:
I put the answer simplified if needed.