- A4
- B6
- C10
- D5
Step-by-Step Solution
By the associative property of addition, the grouping can change. (3 + 4) + 5 = 3 + (4 + 5), so the blank is 5.
Answer: D) 5
Fill in the blank: (3 + 4) + 5 = 3 + (4 + ___ )
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