4. Verify the following.
i. 34 * (-28) = (-28) *34
ii. 8 x [9 * (-5)] = (-5) (8 x 9)
iii. 21 * [8+ (-2)] = 21 x 8+21 (-2)
iv. (35) * [(-9) + (11)] = (-35) * (-9) + (-35) x 11
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