10.

Which of the following expressions illustrates the associative property of multiplication?
4(-1) = (-1)(4)
4 + (7 + 6) = (4 + 7) + 6
(-2 ∙ 1)(8) = -2(1 ∙ 8)
9(5 + 3) = 9(5) + 9(3)

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