D. 
y = 2/3x - 2
the easiest way to do this without doing actual math is to just graph it
 
        
        
        
I think it's :
Part A ; $30 * (x) + $13 
$28 * (x) + $15 
Part B ; so $30 * 4 + $13 = $133 vs. 
$28 * 4 + $15 = $111 so that would mean company B Would charge the least amount. 
Part C ; the difference between company a and company B prices is $22. 
        
             
        
        
        
Answer:
8x^2 + 6xy - 5y^2 + 26
Step-by-step explanation:
See attached image.
 
        
             
        
        
        
<h2>(25) 7th Grade Swimmers</h2><h2>25:80</h2>
        
             
        
        
        
Y=140 because U have to go 35 divided by 2 and 8 times 17.5