The absolute value of a number is basically the distance between that digit and zero (0) therefore making the absolute value always a positive number. In this instance, the absolute values would be the following
Omar |-15| = 15
Jake |10| = 10
Now that we have both absolute values we can see that Omar had the transaction that involves more money. Exactly $5 more than Jake's transaction.
Your volume would be 27 inches cubed. This is because Volume = length x width x height. If you multiply 3 x 3 x 3 you get 27. This resulting in your answer being 27.