I believe that it is a concurrent power
        
             
        
        
        
Answer:
V = pi 36 units^3
V =113.04 units^3
Step-by-step explanation:
The volume of a cylinder is given by
V = pi r^2 h
V = pi ( 2) ^2 *9
V = pi 36
Letting pi = 3.14
V =113.04
 
        
             
        
        
        
Steps:
1. Multiply the first line by 3 and the second by 2
 3(3x + 2y= 4)
 2(8x -3y=-6)
2. New lines are
 9x + 6y= 12
 16x + -6y=-12
3. Now add/subtract them
 25x + 0= 0
 25x=0
4. Divide by 25
 X=0
5. To find y, substitute the 0 in the x in one of the equations 
9x + 6y= 12 
9(0) + 6y= 12 
6y= 12 
6. Divide by 6, your Y=2 
7. X=0, Y=2
        
             
        
        
        
Answer:
The value of first coin will be $151.51 more than second coin in 15 years.
Step-by-step explanation:
You have just purchased two coins at a price of $670 each.
You believe that first coin's value will increase at a rate of 7.1% and second coin's value 6.5% per year. 
We have to calculate the first coin's value after 15 years by using the formula 

Where A = Future value
            P = Present value
            r = rate of interest
            n = time in years
Now we put the values 



A = (670)(2.797964)
A = 1874.635622 ≈ $1874.64
Now we will calculate the value of second coin.



A = 670 × 2.571841
A = $1723.13
The difference of the value after 15 years = 1874.64 - 1723.13 = $151.51
The value of first coin will be $151.51 more than second coin in 15 years.