Which equivalent expression would you set up to verify the associative property of addition for(3x + 4) + ((5x2 – 1) + (2x + 6))?

The associative property changes how addends are grouped without changing their order: A + (B + C) = (A + B) + C. Here, A is (3x + 4), B is (5x² − 1), and C is (2x + 6), so the matching regrouping is ((3x + 4) + (5x² − 1)) + (2x + 6), choice C.

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