Each of the following is an example of one of the properties of whole-number addition. Fill in the blank to make a true statement and identify the property or properties.
a. 9 + 1 =__ + 9
b. 7 + (3 + 5) = (3 + 5) +__
c. a + __= a
d. 7 + (3 + 5) = (3 + __) + 5
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