If x, y, and z are real numbers, which is always true?
I) x (yz) = (xy) z
II) x/y = y/z
III) z (x + y) = zx + zy
- I only
- II only
- I and II only
- I and III only
- I, II, and III
Answer(s): D
Explanation:
Statement I is an example of the associative property of multiplication and statement III is an example of the distributive property. These properties will hold for any real numbers that are substituted into them. Statement II is not a property of real numbers and may be true for certain numbers, but not for every real number.
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