Answer:
1,620
Step-by-step explanation:
Volume = bh
the base is 15x9 which gives you 135
know you must multiply the base x height 
135x12= 1,620
for future length and width = base 
 
        
             
        
        
        
Answer: 15
Step-by-step explanation:
I am assuming the equation is set up like this:
(x+9)/3 = 8
Multipy by 3 to both sides
x + 9 = 24
Subtract 9
x = 15
 
        
                    
             
        
        
        
Step-by-step explanation:
35+35+x=180 (sum of interior angles of an triangle is 180
therefore 
x=180-70
x=110
 
        
             
        
        
        
 The line is 4 units in length.
        
             
        
        
        
You can use cross product to slove this equation.