From my calculations, I have g = -10 
        
                    
             
        
        
        
Your answer would be <u><em>27 Gallons.</em></u>
 
        
                    
             
        
        
        
Answer:
x=16; y=24
Step-by-step explanation:
for (x,23), 23=0.5x+15
x=16
for (18xy), y=0.5*18+15=24
 
        
             
        
        
        
Answer:
f(x) = (x - 10) (x + 10)
Step-by-step explanation:
The equation looks like the difference of squares so 5 and 20 are out
-10 x -10 = 100
-10 x 10 = - 100
so (x - 10) (x + 10)