Work through all the problems in this self-test and check your answers in the back of the book. All answers are there and are keyed to relevant sections in. Appendix A. Where weaknesses show up, review appropriate sections in the appendix.
Replace each question mark with an appropriate expression that will illustrate the use of the indicated real number property:
(A) Commutative ( • ): x(y + z) = ?
(B) Associative (+): 2 + (x + y) = ?
(C) Distributive: (2 + 3)x = ?
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