Mathematics, 19.09.2019 23:00, Damagingawsomeness2

Which expression represents the sum of 21 and an unknown number?
a. 21-d
b. 21+d
c. 21÷d
d.21d

Answers: 2

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Which expression represents the sum of 21 and an unknown number?
a. 21-d
b. 21+d
...