Answer:
B is answer
Step-by-step explanation:
 
        
             
        
        
        
Hello from MrBillDoesMath!
Answer:
n = 5
Discussion:
Let the original number be "n"  Translating the problem  statement to mathematical symbolism:
n + 4 = 19 - 2n                   =>  add 2n to both sides
n + 2n + 4 = 19 - 2n + 2n  =>  combine like terms
3n + 4 = 19                        => subtract 4 from both sides
3n = 19 -4  = 15                 => divide both sides by 3
n = 15/3 =5
Check: Does 5 +4 = 19 - 2(5)? Does 9 = 9? Yes. so the value for n is confirmed correct.
Thank you,
MrB
 
        
             
        
        
        
Answer:
D
Step-by-step explanation:
because if you add the numbers up you will get the answer easy :)
 
        
                    
             
        
        
        
Go to Mathway .com they'll help you out and do it for you 
that way you dont have to wait
        
             
        
        
        
Answer:
C. 
Step-by-step explanation:
The formula for a cylinder is V = (pi) (r^2) (h) so 12*12 is 144. 144*pi*17 is 2448 pi units cubed.