519/6=86.5
915/7=130.7142
439/7=62.7142
812/9=90.2222
so i think its the 1st on but i may be wrong. 
 
        
             
        
        
        
If 6 oranges cost 3.60 than one orange costs .60. To find, divide total price by number of oranges. 
3.60/6 = .60
There is no set of pound in a gallon because we do not know the substance. Different liquids weigh different amounts. 
3.5 gallons is equal to 448 ounces. To find, multiply the number of gallons (3.5) by the amount of ounces in a gallon (128)
3.5 * 128 = 448
Pound and pints are like gallons and pound. Unless we know the substance we cannot solve. 
.75 pints is equal to 12 ounces. To find that, we multiply the number of pints (.75) by the number of ounces in a pint (16)
.75 * 16 = 12
 
        
             
        
        
        
I think the answer is 229.1831. hope this helps!
        
                    
             
        
        
        
<span>36x³a + 45xa² =</span>9xa(4x²+5a)
        
             
        
        
        
First align the decimal points and the numbers,  then add the extra 0's if needed. Lastly, add and the total answer is 14.225.