20% discount makes the price $58. Sales tax brings this to $61.77.
On the website the cost is 54.75×1.09+5.99=$65.6675 for each pair.
The difference is exactly $3.8975 or $3.90 if working to the nearest cent.
For 12 pairs the difference in cost is $46.77 or $46.80 respectively.
        
                    
             
        
        
        
Looking at the chart, we can see that with diet chow, the weight changed by -26, while with kitty diet, it changed by -13. Therefore, the Diet Chow was more effective
 
        
             
        
        
        
 reduce 12/20 to 3/5
multiply both top numbers and then both bottom numbers
8 x 3 = 24
19 x 5 = 95
 so answer is 24/95
 
        
             
        
        
        
Y - y1 = m(x - x1) is the point slope equation. 
y - 9 = 3(x - -2)
(9, -2)
Letter B