Answer:
11.8
Step-by-step explanation:
3(12.4) + 6(11.5) =  37.2 + 69 = 106.2
106.2/9 = 11.8
 
        
             
        
        
        
(-2x^3 +x -5) * (x^3 -3x) 
= x^6*(-2*1) +x^4*(-2*-3 +1*1) +x^3*(-5) +x^2*(-3) +x(-5*-3)
= -2x^6 +7x^4 -5x^3 -3x^2 +15x
        
             
        
        
        
Answer: 26.4 
To find the volume u multiply 12x2.2=26.4