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

A. 21-d


B. 21+d


C. 21÷d


D.21d

User Desmond Smith
by
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2 Answers

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


User Todd Curry
by
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0 votes
B. The variable d represents an unknown number. So, 21+d, is equal to 21+an unknown number.
User Jukka Puranen
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