Seudónimo Seudónimo
  • 23-01-2017
  • Mathematics
contestada

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

A. 21-d


B. 21+d


C. 21÷d


D.21d

Respuesta :

Аноним Аноним
  • 23-01-2017
B. The variable d represents an unknown number. So, 21+d, is equal to 21+an unknown number.
Answer Link
zombiezslayerz77 zombiezslayerz77
  • 23-01-2017
the answer is B because it says sum. sum means addition.


Answer Link

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