What's happening is that every subtraction can be written as "addition of the opposite."
18-5 = 18 + (-5)
One reason this is done in the work you showed is that they're trying to show why you distribute the negative and the 1 into the parentheses, why you multiply everything in the parentheses by "-1" and not just 1.
The other reason is to later to be able to move the individual terms around, so you'll be able to combine like terms.
When you move terms around, the sign has to stay attached to the term, so writing all the subtractions as addition helps keep the sign attached.
 
        
             
        
        
        
          It would be 2.6 x 104 for 26,500 in scientific notation.
        
                    
             
        
        
        
This question is given you the information of the two units mileage in terms of miles per gallon and fuel consumption. G is gallons. Therefore meaning, total distance is equal (=) to mileage times (X) fuel consumption. 
The answer is: A) m = f(g) = 30 × g 
 
        
             
        
        
        
Answer:
   r = 6.4/(1+sin(θ))
Step-by-step explanation:
As the attachment shows, for the given directrix and eccentricity, the equation is ...
   
 
        
             
        
        
        
M= 2.8
Alternate form:
14/5 or 2 4/5