Answer:
c. They are equal to each other.
d. They are the negative of each other.
Explanation:
c. Adding c to d and d to c are the same and thus both expressions are equal. In addition, the numbers can be added in any order and will result in the same final answer. This is also known as commutative property.
d. a-b= -(b -a)
In this case, subtracting b from a is not equal to subtracting a from b. The order of terms in subtraction affects the final answer.