180/10=18 is one but the easitest way is with tens or hundreds
        
             
        
        
        
third option is the correct answer....
 
        
             
        
        
        
It is (7x)
^(2/3). If we look at our exponent laws (SEE ATTACHMENT), we can see that we can express our equation as so.
 
        
        
        
Julian is 24, Kira is 34. The total of both equals 58.
        
             
        
        
        
8*10*14 = 1120
10*8*10 = 800
1120+800 = 1920
volume =1920 cm3