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.

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zombiezslayerz77 zombiezslayerz77

23-01-2017

the answer is B because it says sum. sum means addition.

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