Answer:
Step-by-step explanation:
The vertex and focus are horizon aligned, so the parabola is horizontal and the directrix is a vertical line. 
The vertex is halfway between focus and directrix. Directrix: x = -4
 
        
                    
             
        
        
        
Answer:
translate to English please
Step-by-step explanation:
so confused
 
        
             
        
        
        
If you would like to know what is the unit price for the hair shampoo, you can calculate this using the following steps:
500 ml ... $2.10
100 ml ...$x = ?
500 * x = 2.10 * 100    /500
x = 2.10 * 100 / 500
x = $0.42
The unit price for the hair shampoo is $0.42.
        
             
        
        
        
 the function of quadratic is number4