X= 10. Should be pretty easy
First you divide 439.92 by 15.6 and you get 28.2 which is how many miles per gallon that you are getting. Then you take 28.2 and multiply it by how many gallons that it says (39.7) The final answer is 1119.54
1.1 is greater
8/7 is greater
-1.09 is greater
-1.1 is greater