Answer
The difference of r and 31.
Work Step by Step
Two things are being subtracted, so we say the phrase "the difference of" and then list the things being subtracted. Note, we list the r first since the expression is r-31, not 31-r.
Algebra 1: Common Core (15th Edition)
by Charles, Randall I.
Published by
Prentice Hall
ISBN 10:
0133281140
ISBN 13:
978-0-13328-114-9
Chapter 1 - Foundations for Algebra - Chapter Review - Page 69: 13
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