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OpenStudy (matthew120):
Which expression represents the sum of 21 and an unknown number? A. B. C. D.
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OpenStudy (solomonzelman):
an unknown number can be called "x"
OpenStudy (solomonzelman):
so, if I were to say "sum of 21 and 3" I would say "21+3"
OpenStudy (solomonzelman):
and therefore, how would I write the "sum of 21 and unknown number" ?
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