I'm not sure about d.
This was what I could come up with.
You would at the distances together, since 120 is above sea level and 39 is below. To find the whole vertical distance (the distance they are apart), just add the values (numbers) together.


I hope this helps!
~kaikers
64.8%. 12 times 10 is 120. 3 times 4 is 12 so the total area is 108. 108 divided by 100 is 1.08 times 60 is 64.8%
If we multiply or divide both sides of an inequality by a negative number, you have to flip the inequality. Hope this helps :)