Answer:

Step-by-step explanation:
Explained in picture
 
        
             
        
        
        
It’s dividing by a factor of 10. So 30 divided by 10=3. You then do the same thing for the height. 300 divided by 10=30. The answer is 30.
        
             
        
        
        
Answer:
- 6 
Step-by-step explanation:
Step 1:
x ÷ 3 - 5 = - 7   Equation
Step 2:
x ÷ 3 = - 2   Add 5 on both sides
Answer:
x = - 6   Multiply 3 on both sides
Hope This Helps :)
 
        
             
        
        
        
(x-5)(x+7).
explanation:
(x-5)(x+7)=0
<=> x-5=0 or x+7=p
<=> x=5 or x=-7
        
                    
             
        
        
        
He paid 3.19 per gallon both times......first time he bought 12.53 gallons....next time he bought 11.86 gallons
so ur expression is : 3.19(12.53 + 11.86)