F(x)=12,000(1.08)^x
The answer is the first equation.
The equation increases so 1 is added to 0.08 (8%).
        
                    
             
        
        
        
I’m not sure if the 2 is counted in the equation or not 
Since x=4, substitute it for x in the other equation
4+3y=29
3y=25
Y=8.333333333
2(4)+3y=29
8+3y=29
3y=37
y=12.33333333
        
             
        
        
        
Let x be the number.
Set up an equation:
2x - 2/3x = 20
Simplify:
1 1/3x = 20
Divide both sides by 1 1/3
X = 15
The number is 15