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22 October, 00:04

Which expression represents the sum of 21 and an unknown number?

A. 21-d

B. 21+d

C. 21:d

D. 21d

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Answers (2)
  1. 22 October, 00:25
    0
    The answer is B because it says sum. sum means addition.
  2. 22 October, 01:18
    0
    B. The variable d represents an unknown number. So, 21+d, is equal to 21+an unknown number.
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