Subtracting zero from another integer will not have an impact. However, subtracting an integer from zero will make a difference in simplifying the expression. Keep this in mind for parts (a), (b), and (c).
Remember to pay close attention to each of the signs. Subtracting negatives can be tricky!
Be sure to show your work! And remember, subtracting integers is like taking steps backwards, but subtracting negative integers is like moving forward.