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Geoff must mentally multiply –5 × 0.75 × 20. Which shows how Geoff could use the associative and commutative properties to make this product easier to find? A –5 ×75100× 20 B (–5 × 20) × 0.75 C 20 × (0.75 × (–5)) D –5 × (20 × 0.75)
–5 × 0.75 × 20 could be rewritten (applying the associative property) as –5 × (0.75 × 20). I chose this configuration because 0.75 * 20 is 15. Next, evaluate -5(15). This is -75. This matches Answer D.
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