Answer:
d.
Step-by-step explanation:
if x varies directly as y,
 x = ky
 8 = 12k
 12k = 8
 k = 8/ 12
 k = 2/3,
 x = 2/3 y
now substitute the value of any of the numbers of each pair, and check if it works:
for e.g, find x when y = 15
 x = 2/3y
 x = 2/3 × 15
 x = 10
since you obtain x = 10 when y = 15, the pair is a possible corresponding value of x and y. now do the same for the rest .
 ii) x = 2/3y
 x = 2/3 × 3, when y = 3
 x = 2
hence, this is also a possible pair of x and y values.
iii) x = 2/3y
 x = 2/3 × 9 when y = 9
 x = 6
again, a possible pair of x and y values.
iv) x = 2/3y
 x = 2/3 × 20 when y = 20
 x = 40/3 
here, when y = 20, x is not 15. it is 40/3.
thus, it can be determined that this is not a possible pair of x and y values.
please try to understand and have a great day! 
 
        
             
        
        
        
Answer:
56
Step-by-step explanation:
Recall that 1 lb = 16 oz, meaning that 1/2 lb = 8 oz.
Thus, we need only divide 28 lb by 1/2 lb to determine the number of 8 oz servings are contained in a 28 lb bag of dog food:
 28 lb
--------------------- = 56 8-oz servings
 1/2 lb/ serving
 
        
             
        
        
        
Four batches can be made with 6 cups
        
                    
             
        
        
        
Answer:
1 gallon ever 5 minutes here is the fraction form if you need it for a graph 3/15 or 1/5
Step-by-step explanation:
if there is 3 gallons gone and it is constant then on gallon goes every 5 minutes 15/3=5 
 
        
             
        
        
        
Answer:
1/6 + 4/6 = 5/6
Step-by-step explanation:
I hope this helped