Answer:

Step-by-step explanation:

Adding 9x & 3x gives 12x.

Now taking 4 common from both the terms , we get :-

 
        
             
        
        
        
Answer:
x=60
Step-by-step explanation:
Hope this helped.
 
        
             
        
        
        
Answer: 
if you have to add it is 17  
if you have to divide it is 1.5  
if you have to subtract it is 16
Step-by-step explanation:
 
        
             
        
        
        
Answer:
It will take nine years and four months for the refrigerator to pay for itself. 
Step-by-step explanation:
The new refrigerator which costs $1200, saves the family 22% annually in energy cost. 
Since the old refrigerator costs $580 to run, we want to determine how many years it will take for 22% of $580 per year to make $1200.
22% of $580
= 580 × 0.22
= 127.6
That is, it saved then $127.6 per year. 
Now, 
$1200/127.6
≈ 9.4
Which means, it will take 9 years and 4 months for the refrigerator to pay for itself. 
 
        
             
        
        
        
The ration is 12 muffins to every 21 donuts