Answer:
4y-x+6
Step-by-step explanation:
 
        
                    
             
        
        
        
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Define the variables: a is the number of apples I can buy                                                                        g is the number of grapefruits I can buy.
Write the equation: 15 = 0.50a + 2g
 
        
             
        
        
        
20 tulips. 2/3=20/30 when you multiply both the denominator and numerator by 10.
 
        
             
        
        
        
We can use the vertex form of a quadratic, 

, to find that 

. Plugging 

 ordered pairs into g(x), we see that a = 1. For example, for 

, 

. Solving for a gives 1.